Dude, this is two different miners and they need different intensity --i params for optimal working! It looks like --i 22 is optimum for t-rex but it isn't for z-enemy. Z-enemy need -i 19/20 param it's optimum for that miner.
Nah, Ive optimized these in the past on my system and z enemy performs better at 21.5/22 intensity. I can test them again at different intensities (or their standard intensities). This is a test of the intensities that run the best on my machine.