Idisagree that nitro heats the engine too much. Some heating yes. Lean setting frys the engine, not nitro. Ihave run many engines on high nitro without damage. The OS 160 only needs 15% or less. More nitro does not help that engine.

Yes, nitro can damage some types of paint. There are paints that are not damaged by nitro. Gasoline engines make some people happy. I like those too.

With 20% fuel this OS160 gained ~250 rpm with spark ignition and lower smoother idle. I prefer to keep the rpm instead of lower nitro. This will get 15% when the 20% fuel is gone. Another flier here reduced nitro from ~20% to 5% with the same rpm on the ST. I think each setup will be a little different.

"....Also, to implement the whole thing needs too much time and effort....."
This can only be determined by each individual. Many engines have hidden potential. Even the nice OS 160 gives good rewards for what I consider a reasonable effort.This modified one matches the YS DZ power with less nitro. It runs better than it did on the standard setup. Notice it has a ST 2300 carb! Actually only the outide is ST. The inside of the carb has Webra MC parts. This same setup works great on the ST. You can buy the whole Webra carb if you want to spend $€$€.

I was not satisfied with the Perry pump on normal carbs. Only the MC carb works with the pump the way Ilike for F3A type flying. There are no needle valves. Two servos work the carb with radio mixing.

My Chinese ST runs just like the Italian ones. I don't like the Chinese carb or Italian carb. The carb design makes production easy but not great running.

Lets not make crispyspa discouraged. His carb and pipe can work once he gets his engine back.