Zuley, take a second look at the backside of your wheels on the spoke. My 2015 23RB has 2830 lbs molded into them which equates to 80 psi with the 225 75 15. I suspect yours is the same.
Here is the web page for my wheels (T03-56655BM) as a second point of reference:
http://sendelwheel.com/wheels/t03bm.html
As for heat build up, it is the flex of the sidewall that generates heat as I understand it. So if this is true, a E tire at 65 psi "should not" heat up any more since the flex "should not" be anymore than a D tire at 65 psi. But, I have been wrong before. Hopefully CW adds to this thread.
BTW: my plan is to get E Maxxis this spring and run them somewhere between 65 and 70 psi depending on wear pattern that develops.