So you have a lot of NTSC VHS tapes that you want to convert (maybe restore) to the highest quality onto a digital format (DVD, most likely, I would assume). Alright, check.
VHS tapes suffer from two major errors: color/chroma noise and grain. Many devices, especially low-end consumer ones (including that Canopus ADVC-55) will transfer all of the analog VHS noise to the new digital file, where it will exist forever. Yuck! What has to be done, for the highest possible quality, is for these noises to be filtered out. Most all captures cards, even professional ones, transfer the entire signal unfiltered to a computer.
However, a few years ago, some of the better video companies realized this dilemma, and using components/chips made by video companies (as opposed to computer graphics computers) to create more elite DVD recorders intended for dealing with these noisy VHS tapes. For a while there, JVC had it's own DNR (digital noise reduction) to suppress grain, and used LSI chipsets to suppress color noise. The result was a DVD recorder that made DVDs that looked better than the VHS tape. These models were only made in 2004-2006, models DR-M10, DR-M100, DR-M30, DR-M300, DR-MV1 (combo*), DR-MV5 (combo*) and some "JVC Professional Series" decks (I forget the model numbers off hand, and they are crazy expensive!)
* The VCR in the JVC combo unit is a low-end piece of crap. If you ever use this machine, pretend the VHS slot doesn't exist, just use the DVD recorder half!
Toshiba also made some machines, which filtered based on temporals and intra-frame only, no "chroma filtering" per se, but it did quite a nice job of cleaning up chroma/color noise anyway! These models included RD-XS32, RD-XS34, RD-XS35, and were mostly HDD (hard drive) based units. More expensive, less made, harder to find even when new.
These JVC and Toshiba machines are what I had referred to as "cleaning devices" for you.
But maybe I'm getting ahead of myself, let's back up a minute.
You now have a JVC HR-S9911U S-VHS deck, which is quite nice. The JVC S-VHS series machines have several image filters, including a DNR+TBC made for cleaning the image. The JVC machines will handle most tapes most of the time.
(Please note, no VCR will handle all tapes all of the time. Anybody that says otherwise is either lying, or is an idiot!) Anyway, the JVC machines will clean up most low-level to moderate chroma noise with the TBC. So the aforementioned JVC or Toshiba DVD recorders may not be needed. However, sometimes tape errors prevent the TBC from being used, causing secondary reactionary errors, such as "tearing" or jitter. In this case, you would be stuck with chroma noise showing, and something after the VCR would be needed to clean it up! It has to be done in hardware too, digital removal methods are very unreliable, and even the best methods leave ghostly artifacts/noise not found with an analog hardware filter. So that's where the advice for "cleaning machine" DVD recorders comes from!
For as much as people cry about "quality loss from re-encoding", restoration is about dealing with poor sources, and making them better. A couple of re-encodes, even from compressed intermediaries, isn't going to do any harm. That Canopus ADVC-55 is a nice device, but it works best on a perfect noise-free video -- not a murky old VHS tape. The quality you might gain from lesser-compressed DV (as opposed to MPEG-2 from a DVD recorder) will be entirely lost on all that digitized noise that wasn't removed. You can play a tape in the JVC VCR, run it into another TBC to avoid any false anti-copy issues (or other signal-based problems), use a proc amp if you want (I suggest it!), and then feed it to an image-cleaning DVD recorder in XP mode (high bitrate MPEG-2). Take those MPEG-2 files, and then open in restoration software like AVI Synth,
VirtualDub 1.8 (with MPEG-2 input filter) or TMPGEnc Plus --- software with heavy filtering abilities. Filter out whatever couldn't be fixed in the hardware.
I know this has gotten a bit long, maybe even a bit heavy on the jargon. But it's an overview of your workflow -- I didn't include details on how to use each device, software help, lots of scenarios ("what if's"), etc. That comes later, if needed. I mostly wanted you to understand why the "cleaning machine" DVD recorders are an important consideration.
Two other random thoughts...
Please note that the "proc amp" found embedded in an AVT-8710 is a joke. It is so mild as to be near useless. It's not a proc amp replacement. But that TBC is excellent! I suggest it highly! Just don't expect those weenie proc amp functions to do much for you.
The detailer can be one of the least important devices for cleaning, but it is nice for the ability to re-sharpen video
(psycho-visually speaking, of course!) -- very nice for making SP mode VHS recordings look almost DVD-sharp, or to make fuzzy VHS recordings look a little more crisp.