Wow, this was a great response to my question.

Looking at the response and thinking about it a while, with this sort of inexpensive engine, I think I will stay with the change in nitro percentage and a swap to a better tuned exhaust for the setup I am using. The knowledge of tuning the piston sleeve reaches beyond my capabilities for now. Plus as mentioned I do not have the tools nor the patience for that skill set. I am pretty limited with this engine. I plan to look into a nicer brand with a better quality name here soon. It may take a while before I settle on one,due to being such a picky person. I like to be sure of what I am investing in before I make a purchase. Thank you for the information. Very much appreciated!