What are dimensions of all your polyps?
I had three polyps with large one in caecum (similar to what you have).
All of them were removed during colonoscopy.
Afterwards right hemicolectomy was performed for "prophylactic purposes".
I would recommend to get a 2nd opinion - find and talk to a colonoscopy expert.
In my case 1st GI surgeon was able to remove 2 small polyps during my 1st colonoscopy and referred me to another guy (who was doing only colonoscopy/gastroscopy and nothing else) for removal of a bigger sessile polyp.
58 yo male at diagnosis - T1bN0, 0/15 lymph nodes, low grade/moderately differentiated adenocarcinoma
03/2016 colonoscopy #1: 2 small polyps removed in left colon; CEA = 1.3
04/2016 colonoscopy #2: caecum sessile 3.5 cm polyp piecemeal removed with kind of clear margins
05/2016 CT scan, blood test ...
05/2016 "prophylactic" laparoscopic right hemicolectomy with a few complications (bleeding, leak, infection)
06/2017 CT scan (lower body), colonoscopy OK; CEA = 1.6