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I would not advance the cam on any angled valve engine.
Remember the valve cutouts in the piston ?
They are here because of inlet valve advance and exhaust valve retard ...
Also, advancing the cam means more overlap wich cause lower rpm operations to be more temperamental.
Just sayin' ...
Reducing peak torque rpm is either shorter cam, increased compression ratio, more velocity in the inlet throught smaller throttle body, tuned lenght on the inlet, increased back pressure, agressive cam timing.
Honestly, I wouldn't spend time or money on any of these.
Bike engineers, they tend to maximise the potential of the engine in the first place anyway ...
There is this device that is fitted by motocrosser thought.
It is fitted after the throttle plate and is designed to increase velocity hence boost torque for moderate openings.
That is basically a flat piece of metal that improves the geometry of the air path after the throttle plate.
Worth a shot, especially when you have only one (single rules !) and you can maximises its use (unlike motocross where you are much least at a steady throttle opening)
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