[Gaz64]

Depends on the effort involved to change your timing.

If your have easy access to the cam gear AND you have a vernier adjustable cam gear then you could retard it 2 degrees to start with.

But as noted above, any timing change would necessitate a piston to valve clearance check.

In your case, retarding the cam timing closes up the exhaust valve to piston clearance at TDC.

Generally, if you want to move the torque band higher, because the engine has too much low speed torque, you're better off fitting a larger camshaft.
It will give you less low speed torque and more high speed power.
If then you have insufficient torque, you could then advance the cam allowing for valve clearance on the inlet at TDC.