The low quality capture card is a major stumbling block here. What you're seeing is not unexpected. Better VCR, better capture card, some sort of frame TBC. But to fully avoid problems, best quality, JVC S-VHS VCR with line TBC, actual frame TBC, and recommended capture card.
I think 7500 is non-TBC in PAL, same for 8500. Hence we cheap.
Buy good PAL decks from VCRshop.nl
Elgato earned the nickname Elcrapo for the crummy video capture cards.
DVD EZmaker is junk.
PowerDirector is junk.
OBS is not analog capture software, wrong tool for task. Use
VirtualDub.
SCART/composite is always low quality, added issues. The better VCRs have s-video.
What OS for capture card. WinXP/7 best, Win10/11 worst.