No. The additional octane did nothing at all. If you were using Shell gasoline for the oxygenated fuel I can see where the rough running occurred. I've experienced the same thing with their gas in any octane level.

An issue of lost volatiles may have occurred if the oxygenated gas had sat around for a long period of time. Gas retains it's octane additives when it sits but will lose it's more volatile components.

For the guy asking about Dubro filters.

They are absolutely useless for filtering gasoline. Using a felt filtered clunk inside the tank and inside the gas can will eliminate any fuel debris contamination. The Walbro filtered clunks are also a lot heavier than standard clunks and do a much better job of keeping the gas line immersed in the fuel inside a gas tank. Because of that additional weight they even overcome the stiffening of Tygon line inside the tank. Another feature is the felt clunks pick up the last drop of fuel in the tank, break up line bubbles, and don't have to be fully immersed in a fuel quantity to still effectively draw a constant supply of fuel. They only need to be touching the gas.

Too many advantages of using a Walbro filtered clunk to even consider anything else. For those that have a belief they shed fibers and clog carb screens, many thousands of hours of operational use has proven that to be a fallacy. Out of the bag and into the plane.