My 2 cents
I too just went through a profession ( which means $$) carb/s overhaul as I was at the 200 hour inspection interval but next year I would be at the 5 year rubber replacement interval.
After discussion my situation with the shop I decided to do the overhaul early. Received the carbs back and all looked good and the parts replaced were also returned. Everything looked fine and believe me it was tough to "fix something that wasn't broken."
The only thing needing attention was the plastic bushing on the control arm of one carb where the spring rides.
FYI I maintained the control arms in the same position prior to removal and when reinstalled the carbs were still in sync.
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold