Try using something like a popsicle stick: no sharp edges. Or next time your at the market, go to the baby food section and look for a coated spoon.
It seems that loss of appetite this time of year occurs when temperatures are not maintained at 75 degrees (and thats the cool end) to 85 degrees, and when the light is inadequate.
I'm not going to comment on the use of infrared, because everyone uses different methods, and mine are all outside hibernating now.
Do you not have any sort of daylight' or 'sun' bulb? I don't think UV alone is adequate.
When I had to keep my guys in last year, they had full-spectrum fluorescent lights & a UV light on for 14 hrs a day, and a ceramic heat bulb on 23 hrs a day, acces to clean water at all times, things to climb on, etc.
I had had to keep one in because he was underweight, and I had to help him eat through the winter: the objective was to prevent further weight loss, so we didn't feed him every day. Once he had something in his mouth, he swallowed on his own.
Get a reading on those temperatures for us.
Stephanie