I was trying to keep the engine running somewhat rich, but wankel tends to smoke a lot anyway. In fact it runs so hot that using synthetic oil in a wankel is like putting smoke fluid in a conventional engine: they both are promptly converted into smoke . That's why it's necessary to run castor oil in a wankel. Full synth is NOT recommended. This is important: lubrication is probably the single most important factor when it comes to the service life of these wankels. Also, with a 50/50 blend, I wouldn't go below 20% or better 22% total oil content.
Finally, 15% nitro is a bit too much IMHO. I tried that level of nitro in mine and the engine got so hot that it took almost 10 minutes for the engine after the run to cool down enough to be touched. You could try adding some castor oil to your fuel, but I think the best idea would be to mix your own fuel. It's also very cheap if you can get methanol for a good price. This is not to blow tou off I'm writing this in order to help you extend the life of your engine as much as possible. Feel free to ignore these pieces of advice, if you want.

I had forgotten to touch the glow plug in my previous post: the type I SHOULD be run with its special RE type plug. However, this plug promptly disappeared from the market together with the type I engine ([:@]), so it's necessary to experiment with other glow plugs to see which one works the best. I'd suggest to start with an OS F plug, as my engine came with an F plug fitted (though I had bought a set of five RE plugs with it). For my test runs I've only used an RE plug so far, but the F should at least be able to get the engine running.

Radial.