capturing video from VHS flickers
I did this a few years ago, digitized dozens of my family's old home videos. 

The way I did it was, as at the time I was doing it from home and didn't have a IO device such as a DeckLink, I simply used a MiniDV Portable Recorder I got off eBay; which allows composite, component, and S-Video In. 

Once the VHS tapes were transferred to my "Digital Intermediate" so to speak, I simply did a standard FireWire Capture using Premiere. 

This also provided me with a set of DV Master Tapes as a backup. 

You can likely get a used MiniDV HDV Record Deck off eBay for a few hundred dollars now that tape is dead; and just flip it when done (basically no cost if you can sell it for what you pay for it). 

Going straight from Analog Tape, really requires a real IO device such as a DeckLink card to get good results, and a DeckLink card with analog IO will be much more expensive.