Lets talk about the money... You have choosen ST because of good performance vs. price ratio, OK ?!
What ever you do with plugs, fuels, propellers ST is going to be a ST and more you spend on it with
other gadgets, worse gets the ratio Performance/Price. I found myself involved in this "game" with
some engines sometimes ago and then I took the "smarter" approach; it is maybe worth trying by
yourself. Here is the idea:
- You have got the RPMs with all those gadgets.
- Try then with Castor20%, Methanol80% what RPMs you'll get. Castor you can get very(!) cheap
from the local Chocolate Factory and Methanol from the local factory which makes Washing
Liquids. The price of this fuel is then maybe about 3x lower than any ready fuel.
- Post us the comparisson; that will help RCU readers (I wander should I buy ST too...)
- Go flying with different propellers (the Flight is the goal, isn't it?!) and see which one
propeller matches your plane and Style of flying ; the only good engine performance is
not everything.
- With money you save on Fuel, then you buy a better engine, for example Webra or MVVS
or OSMax, which on the same weight have bigger displacements and thus lot more power.
- to avoid the gum pilling in your engine from the Castor-only fuel, at each of the
flying days, use for the last flight fuel with 20% good Synthetic Oil fuel, for example
the Graupner's Aerosave Oil and then your engine will be clean and last almost forever
(till a crash on asfalt...). (In Europe the RC prices have weaking effect on the RC funs...)

Cheers,
Nick