Hot & Sags! HORRIBLE FOR SEXY-TIME!

I bought this bed when my back was broken (L5-S1) at the end of 2012 from Matress Firm. I have an adjustable base, which is the only thing I've used it with. The matress felt great, at first, but within 1 year, it began to give in the middle. It is supposed to be the "Air Cool Sleep System" but it is EXTREMELY HOT! I HATE sleeping with someone else in the bed, because I just roll into them. I am 5'2 about 130lbs, and it is OK- AT BEST to sleep on alone (I still wake up hurting and hot) but it is A-W-F-U-L with partner. It is WAY too soft, and it super sucks for intimacy (no response at all! I have to use pillows for support under my back/stomach). If I want to sleep some-what ok with a partner, we have to be on opposite edges of the bed, and DON'T EVEN THINK about touching me or it's instant sweats-ville. :-/ I am working on a warranty claim through Mattress Firm now. The warranty says Code: 0 (which is 25 year limited warranty, 15 year no-charge warranty, if greater than a .75" sag). I think I am right at that, so I may have to wait a little longer. Fingers crossed!