Lowering ETG's
 

I am new to diesel performance and have done a few upgrades to my truck and had no problem accelerating up any hills on a recent hunting trip pulling my dads old 25' camping trailer but there was a couple times I had to slack off cuz my ETG reached safe max for the 6.5. I tried looking through old threads to find what I need but couldn't. I need some input on ATA, WTA, and WMI if anyone could help.
The upgrades I have done are:
F intake
4" exhaust
CAT and muffler delete
PDM relocate and cooler
#9 Resister
Crossover pipe
Marine injectors
Turbo Master boost controller (running 15psi)
Heath TowMax ECU
EGR and MAF delete
K&N Air filter
ETG, Tran Temp, and Boost gauges

:tu:Thank you in advance for any and all help

First thing i would do is make sure your air filter is the cleanest it could possibly be. I assume you are using the stock turbo? Try lowering the boost to 12lbs because that's what heath recommends with his turbomaster and all his tunes. If you use this for towing regularly, may I recommend getting that stock turbo off and replacing it with something more suitable for this engine? By suitable I mean bigger. The stock turbo is absolute garbage and is out of it's efficiency range by the time you hit 2200. This drives Intake air temp up, because it's heating the air to compress it, which in turn is making your EGT's high. I'm not saying that's the only reason. But i've dealt with this and I ditched the stock turbo and never looked back.
Try dropping the psi to 12 so the turbo won't try to work as hard for that last 3lbs.
Also, WMI is ok for these trucks to an extent. Most people just run water, but i have read up to 10% methanol works pretty good. I wouldn't try and put a ATA on, the only place they can go on these trucks is down where the skid plate is. One wrong stick or rock and there's a $500 paper weight. But seriously, before you go putting WMI on your truck trying to control egt's, just put a bigger turbo on. It should help in more ways than EGT's my friend. 6.5's with bigger turbos are actually pretty decent trucks. You already have all the supporting mods, I think you would love an a-team turbo, they don't make over 20psi especially with a tow tune and they are made to tow. My truck will tow 10k no problem honest. And no, I dont work for anybody involved with 6.5 performance parts lol