He eats Kaytee fiesta guinea pig food now. I sometimes try and mix rabbit food in too. He has unlimited Timothy hay but sticks to his pellets. His weight is really good. Hes more on the skinny side. That's why I worry that hes not eating enough. I dont feed him veggies all that often.I'm in GR and see Dr. Ritzman (an exotic & rabbit specialist) at Cascade. A physical exam & consult will run $65 over here, so you should probably expect something similar over there.
I agree with Preitler that an overly rich diet (for a rabbit) can lead to your buck not eating his cecals.
How's his weight and body composition? Obesity can lead to problems with reaching & consuming cecals as well.
Really, just seeing a rabbit-savvy vet is the best option