I also just read about having the head shaved and getting higher compression and not having the right octane could cause dieseling as well.  I just had my head shaved down and i'm only running 87 octane so now I'm wondering if this could be a issue. 

Let me ask you guys this…..At what compression should you run what octane fuel?

How much was shaved off of the head?  How does the shape of the squish band compare to the shape of the top of the piston?   What is the piston to head clearance?  You may have shot yourself in the foot by having the head shaved.  High octane fuel sometimes will not help some head shapes!