Hi there. Yes, lol I have broken in hundreds of engines (literally). I offered it as a service at our track (along with engine modding).Have you broken in many engines?
The pinch in a large engine like the force 36/38 lrp30/32 can sometimes be extreme,
To the point where I've had to wind the engine down from Tdc with a screw driver on the flywheel with the glowplug loosened,
I don't give information on hear say and speak from the experience,
I've had with the large amount of nitro engines,
Any of these engines I've listed above will blow away a force 28,
The force 28 is a good wee engine but won't hang with the above mentioned mills.