Nah, I don't use pyro type stuff...yet. I've adopted a one-in, one-out policy and I'm not sure which of my regular developers I'd be willing to give up to try another.
I think our individual metering habits affect our results more than we'd like to admit. Then you throw in meter calibration, etc., it's a wonder any of us ever agree on anything.
Regarding the presoak, I dunno. I recently tried some 35mm "Freestyle" ISO 50 film labeled Made in England. I assumed it was Pan F+ but it doesn't look like it. The raw film stock looks much different. The negatives are similar tho'. Absolutely no color in the presoak effluent. Who knows...presoaking is mostly voodoo anyway.