I go to dr Shen yearly for my scope. He uses miralax for prep, 2-4 ounces is always enough.
He also started me on entivyo for pouchitis and it is still working after 2 1/2 years.(local dr does orders for this) most local GIs know Shen is the expert!! Previously I was on the rotating antibiotics and ended up with c diff. I wonder if Dr Shen still does video visits?? He said he really enjoyed doing them during Covid. Maybe you could get another opinion from him??
good luck.