My hognose male Tamaki has lost about 15% of his body weight and last fed on a hopper on 9/28/2012. He was weighing in at 37 grams when he was taking weekly or once every 2 week meals and is now 32 grams. I know hoggie males are notorious for holding out and not eating so I'd really like some second opinions on whether I'm being paranoid or it's time for a vet trip/something.

Feeding - He was eating prekilled hoppers. So far I've tried live hoppers, live fuzzies, brained hoppers, brained fuzzies, putting him in a deli cup with a prekilled large fuzzie overnight, boiled smallish hopper. I'm gonna try covering the front of his viv for a week-ish and offering live fuzzie again. He hasn't shown much interest in tuna broth, chicken broth, or salmon as "scenting" before so I have yet to try those again.

Viv -

He's in a 10 gallion with 8 watt UTH on right 1/3 of tank on a Hydrofarm Digital Thermostat set at 90 degrees but actual fluxuations in temp vary from 87.9 - 91 degrees on hot side. The light is a 20 watt bulb on a day/night timer - 16 hours light/8 hours dark and during the day is the reason why the hot side gets to 91 degrees at times. Cool side runs 67-70 degrees in the night time and 70-73 degrees in day. Three sides and bottom are enclosed by thin insulation sheeting (for heat resistance).  Bottom 1/3 of insulation under tank on the left side is cut out and glass is left bare. Substrate is reptile carpet covered by paper towels. Water bowl in middle, Hot and cold hides are hidden under leaves of fake plants for "cover." Screen wire top with locking hatch door on top..

Observations on current condition - Eyes clear, mouth clean and pink inside, no dots or discoloration on skin between scales, no wheezing, burbling etc. Running my thumb over his vertabre (spine), feels no different than Kyouya's (other hognose) as far as I can tell. Regularly witness him drinking water. He is active during his usual times - late morning, early evening, and right after his light clicks off but not frantic or frenzied. One piece shed, including eyecaps on 11/05. Most recent poo was on 12/08 (I even took a picture for you guys)

Is it time for a vet trip? Am I missing something obvious I should change? Should I be patient longer? Any suggestions on what feeding trick to try next?