I have to agree (to a point).
If you could go back and capture again at a higher resolution that would probably provide the best possible result.
Can’t really do that with VHS. Any capture card pulling off composite or svideo will be clipped at 480p (or 576p for PAL). Only other option is to use a DVD/VCR that also has component or HDMI outputs, but then you are just using whatever digital scaler is on the DVD/VCR combo unit instead of software on a PC.
I’m sure there are some sort of ways to “hack” the recording software to save a larger resolution, but not sure if that is actually reading that much more information from the VCR across the composite/svideo cable.