Very fond of my DTT trans.
Kind of depends which EZ you have, mine is an early version that has 6 settings. The later versions had the extra pins clipped, then even later, the in cab switch for 1 thru 3.
I would guess if your EZ on 3 is supposed to be 90hp, then that's alot of pressure. My truck just likes the EZ on 2, I have dynoed with the other settings, and when my truck was stock except for the EZ and AFE intake they did increase hp. Now it seems to make little difference above 2, you can hear the injectors rattle harder, but dyno results proved the extra pressure was not worth the risk.
Hope that helps, Jess