I would find a good gram scale and start monitoring his weight, that way you know for sure how much weight he has lost.

My biggest went off feed right around the same time yours did, (10-25-13) and only recently started eating for me two weeks ago. In that time frame he only lost about 150 grams. Its completely normal for a ball python to go off feed for months, I'm pretty sure we have people on this forum who's snakes have gone 11-14 months without eating.

Personally unless you can notice a drastic change in behavior, and weight in the snake, there is no reason to force feed it anything. To be honest, by force feeding him you could prolong the hunger strike and just make matters worse for yourself.