Talk to Gastroenterologist on Incomplete Evacuation Of Stool

I have severe bloating and burping issues since three years. I went to differrnt gastroentologists and got endoscopy and colonscopy done. after the colonscopy my gastro recommended defecography and in that defecography report, it said that not all residual matter gets out completely for which my gastroenterologist recommended to get pelvic floor and biofeedback therapy. Once I am done passing stool, i have to manuallu evacuate the some waste otherwise it is horrendous thorug out the day. I needed an opinion whether should i consult an specialized colorectal surgoen before getting the therapy done since I feel there is something wrong with my bowel movement. My burps become severe after every bowel movement.