No experience with the EZ, but my 01 Cummins has the Attitude. I've upgraded my HY35 to the HX35 (which your should have already). I have a 4" exhaust and just stock injectors. I can keep the exhaust temps below 1200° pulling my 10,000lb trailer in the tow setting of course. My tow setting (level 2) is a 60hp bump, and I believe the EZ has a 65hp bump on level 3 (highest Level). So with the hp levels being similar, I think your temps would be OK if you have a larger exhaust. With stock exhaust, you may be pushing it. I would recommend getting a fuel pressure guage for your fuel pressure going to the injection pump. I could run my fuel pressure to 0 psi on the stock in tank fuel pump upgrade!?! Also a Pyro in the exhaust manifold is also recommended with upgrades... Just for piece of mind. Better safe than sorry.
Ah yes, better fuel image as well! I picked up 4 mpg with the programmer, exhaust, and a big caterpillar air filter!
Hope comparison helps with your question...