hi
i read ur problem
i think ur injector pressure is very high n ur piston ring close gape mutch hiher side n piston n liner / block claerrnce is too mutch high , so i think that is main problem in ur engine.
may be possibel in petter type high speed engine cose probel with fuel pump planger seal is wick
i think so its main reasion
u wright to me in detail at my email address , i can help u my email address is tank9008@yahoo.co.in
........................m.tank