Belt tension must be equal on both cylinders when degreeing the cams otherwise there will be some extra error between cylinders.
The error between tight belts and snug is around 4-5 degrees and very loose 5-7 degrees .
If you degreed them to 108 with snug belts there more like 104 when the bike is hot and running . Fine for a 944 but a 966 with a longer stroke (much higher compression) unless the bulder milled some from the pistons ? 104 centerline MIGHT BE ? to far advanced . I would try 112 with tight belts - it may hit the sweet spot killing your detonation problem and releasing some top end with minimal mid range loss . Its not gospel but its worked for me on some very hi compression 4v engines. When an engine is in detonation it causes a power loss.
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