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: T1bN0M0, 0/15 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 "prophylactic" laparoscopic right hemicolectomy - bleeding, leak, infection
06/2017 CT scan, colonoscopy OK; CEA = 1.6
A lot of funny stuff discovered by CT scans in liver, kidney, lungs, arteries, gallbladder and a lymph node