Coleman is 55 octane , not good for a high performance two stroke.

The issue I have seen with oxygenated fuel is people let them sit without running dry. The problem is people not adapting to new fuel formulations which boils down to maitnenance.
If you have problems with the new fuel its not the fuel that is the issue it is your maintence and operation.

I maintain a fleet of lawn tool equipement and see no issues with the formulation of the new fuel. These engines run everyday or at least several times a week.Letting them sit for weeks at a time causes the problems.