Why do you think the engine is designed? The engine can be set to all kind of nitrocontent. It is all about ignition timing of the self combustion. The moment of ignition is set by nitro content, compression, glowplug number and outside temperature.

Our engines will run fine on 16% but there will be a loss on the bottom power (for what it is worth), you can correct that by taking out 0.1mm of headshim and from there you will be quickly used to the very slight power loss. (if you can feel it at all)