I do experiment with another developer or variation from time to time, but not often. Only when I hear good reports from people who I respect or I am in a state of confusion or turmoil.
I let the final negatives & prints be the guide. If I can't see a difference after having the prints up for awhile next to my known standards, I don't change. If it isn't an improvement I can see I don't change. Each change entails more than just that, it changes some working characteristics, methods & mental approach that all interferes with what I am trying to do, get prints that are the finest I can produce.
If that means using nasty stuff like Amidol, so be it. In small amounts it is fine & controllable & easy to mix. Same with the Pyrocat HD from Sandy King(thanks to Sandy for coming up with this stuff- it is excellent) Having known materials that work predictably & without odd & unexplainable failures(like Xtol) takes the worry out of things in a big way. I can then concentrate on the images and not the process.
Maybe there is something finer than Michaels Amidol, but I have not yet seen it. The bottom line for me is that it works and gives results nothing else matches.