Let's start at the beginning. You're way ahead of yourself. Your monitors aren't calibrated.
Why would you buy a PC monitor that shows only 75% of the sRGB colorspace? Think about it. There are better monitors for sRGB color. There are other factors at play in the color systems used, but from your description it's obvious that you're using uncalibrated (unsuitable) monitors.
To properly calibrate a PC monitor you need a kit containing a color probe and matching calibration software. To calibrate a TV you need the same color probe and some free software like HCFR to manually calibrate TV. If you're using a TV as a PC monitor, you've succeeded in making your life more difficult for video work. Most PC graphics cards make extremely inaccurate TV drivers.
Calibrating a PC monitor with a color probe + calibration software kit. This link uses an older version of the i1 probe, but the software and method hasn't changed much. Almost all PC monitor calibration kits work the same way, whether you're using an X-rite or a DataColor Spyder product: http://www.tftcentral.co.uk/reviews/...e_display2.htm
Current version of the X-Rite i1 PC calibration kit (EODIS3): https://www.amazon.com/X-Rite-i1Disp...+i1display+pro
Current version of the Datacolor Spyder5 calibration kit (S5EL100): https://www.amazon.com/Datacolor-Spy...er5elite&psc=1
Calibrating your TV is another story and another method, but you still need the color probe. The software for TV calibration is the free ColourHCFR v3.04 (https://sourceforge.net/projects/hcfr/files/
). HCFR is used with an older method of calibration that is easier to use and setup: http://www.curtpalme.com/forum/viewtopic.php?t=10457
Then there is the new Calman Chromapure method that's far more expensive and harder to use: http://www.curtpalme.com/forum/viewtopic.php?t=35322
X-Rite and Spyder5 sell less pricey versions, like the X_Rite ColorMunki (https://www.amazon.com/X-Rite-ColorM...YBZ8P3BR1EF78B
) and the Spyder5 S5P100 (https://www.amazon.com/Datacolor-Spy...resws%5CSp5100
). Both are fully auto with fewer features and somewhat less accuracy. But they beat the heck out of so-called "Calibration" DVD/BD discs, which is the same thing as no calibration at all.
Otherwise you're wasting your time with poorly adjusted gear. You might also consider that wide-gamut monitors refer to D6500 standards, not necessarily to sRGB. Two different calibrations would be required, one for PC monitors and one for TV. You don't use wide-gamut monitors for most video work, which is almost all 8-bit.
Better read up on this stuff before you spend time and money. The TBC you're using wasn't meant for analog sources like VHS. Is your TV a wide-gamut TV and do you get wide-gamut broadcasts or buy wide-gamut DVD or bluray??