I currently have Wellgo Track Pedals on my bike, and i like them because they match my bike, and the pedals feel nice and i haven't had a problem with them.

however, the think leather straps and the toe clip are pretty lame, and im looking for something much sturdier and responsive, so i want to buy some nice thick, fat straps for them

I am currently looking at Hold Fast straps as they seem durable and have gotten good reviews, but will they fit my pedals?

I also would gladly welcome cheaper or more reliable Hold Fast alternatives

Wait...what do you mean by "resposive"?
I don't get how they can or can not be responsive...longer to get into or something?

Anyways...

HoldFast are supposed to be used with platform pedals(BMX, DH pedals) and the straps might be too thick for your pedals.

responsive as in holding my foot down better than the leather ones i own now, which are weak and give a bit before they fully stop my foot from rising

Positive is the word I think you are going for