Something else to keep in mind with E10, just like E85, is that it doesn't necessarily contain10% exactly. By law if it states 10 % ethanol on the pump,it must contain a minimum of 6% and out of 10 stations I tested fuel from,only one was above6%
I have been testing a few different carburetors and doing some emulsion circuit tuning lately with pump gas and there is a lot of power to be found getting the mixture where the engine likes it everywhere.
Keith