Boy, I don't like it that you say the back of your truck sags. It shouldn't - period, if the load leveling hitch is set up properly. And, if following the instructions in setting up the hitch can't correct the sag, you need a higher capacity hitch, not springs.
Electric brakes ARE somewhat tricky to set up. Ideally, you want it so that you don't feel the trailer either pushing you or pulling back on you when you brake. In other words, for the most part, the trailer brakes stop the trailer and the truck brakes stop the truck. It won't be quite that "perfect", but you should be able to get it close. At about 25 mph on level ground, you want to be able to manually apply the electric brakes only (push the button on the controller) and not have the trailer wheels skid.
The CHT sounds fine. The TFT is worrisome though. I think they DO make higher capacity transmission coolers, possibly with their own fans. Regardless, you're going to have to change the fluid more frequently. If the TFT never goes above 219, yu're probably ok with your current setup.
When you climb hills, try to keep the transmission from shifting. This means dropping it into 2nd or even 1st, so that it's locked in gear. And, unless you're going dowhill, overdrive is probably something you won't be using, but again, let the transmission tell you what to do. If you feel the TC unlocking and locking a lot or if it's constantly down and upshifting, then lock out the O/D.
Have fun!
- Jack
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