Raising the temp of the hot spot should raise the ambient temperatures too. I had to up my hot spot up to 95 degrees to get an ambient temp of 80. That probably sounds a little high to you, but they've been doing fine. Nobody is burned, they all enjoy staying in their hot spots, and I've noticed that they digest their food better (poop more often) than they did when the temp was lower.
My home is at 75 though, so it's a little easier for me. If you want you could try insulating the rack more. I saw a guy on here not long ago who had problems keeping temps up, so he put some metallic looking insulation on each shelf. Wish I could remember the name of the stuff. I was thinking of doing the same thing, but with aluminum foil, because I'm on a budget. Might help spread the heat some.
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