I read back to page 78 and didn't see what you are running.

I assume you are using 10/10 glow fuel.
You may be a canadate for 15% nitro.
The test is if you remove power and the idle slows more than a couple 100 rpm.

Oil content isn't as important as one might think, as long as there is enough.
If you have 15/18 or something close mix up a small test batch and give it a try.