While you may not have your hot spot at 90, Bob Sears himself (who imported most of your captive Hogs btw) kept his temperatures exactly as I just described. Here's a caresheet from Reptile Rapture specifically for Hogs as well specifying 88-90.
http://reptilerapture.net/hog-island-boa-caresheet.html
I personally want to see a hog cross that is on even small rabbits.