Don't think your valve is burnt with that hi of compression.
Have you checked your valve clearances?
Have you checked your valve/camshaft timing?
Have you checked your cam chain tension?
Checking your sliders is probably a good idea too. (may have had one flop over)
Maybe check the clutch, bell, and belt. You might be slipping
Lastly, can you try a different CDI just for the Hell of it? It almost sounds like a timing issue. (which is why I want you to look at valve timing)
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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