You list four or more films and three different developers. Pick ONE of each. Shoot some grayscales, shoot some exposure gradients (a series of progressively underexposed frame, a series of overexposed frames...). Test and see how far off you really are (how do the edge numbers and leaders look? Fully black?). Settle on your times and temps and follow that ONE procedure until you can comfortably shoot what you expect.
Trying lots of different films and developers is just asking for trouble if you don't have a "baseline" -- a known process that you can do consistently -- from which to guage the success or failure of the others.
Yeah, you need to limit the number of variables as much as possible. 2 bath devs are nice and easy because you just give everything 4+4 mins or whatever and they keep a lid on the highlights too.Just take your time and you'll get it right.