Dunno if the K-Var set is the same as the Gordon Tech set. I believe the Tapco and the Gordon Tech set are the same. Anyway, I've tried both the GT set and the RSA set, and prefer the latter.
I don't know if it's true of all Gordon Tech's, but with mine the trigger pull was very long and very very smooth - with the result that I never knew just when the trigger was going to let off.
My approach to the RSA was completely different from yours: I installed it and then fooled around with the adjusting screws to see how it worked and to get an idea of how the adjustments worked. I adjusted it to a two-stage trigger with medium pull and crisp let off, very much like the trigger pull on a Mauser. I used blue loc-tite (i.e. the kind you use for scope mounts and other non-permanent installations) on the adjusting screws and they've stayed put for a couple of thousand rounds. RSA I believe recommends that you peen the setscrews in place to completely eliminate any chance of them loosening up - seems like un-necessary overkill to me.
An added bonus for the RSA is that they're the only folks who make a properly-configured US-made SAR-3 hammer.
I'd recommend the RSA for gadget-freaks and accuracy nuts with money to burn.
I'd recommend the GT for traditionalists with better economic sense than I have.