Did (do?) you keep track of the Static Compression Pressure before and after this cam change... This change Might have something to do with the ping.
If the "intake valve" closes Earlier than before with the the other cams (smaller number) Then
added compression IS there..
I always Keep track of the Static Compression in my bikes Just to see IF and When they change...That way you have a in-sight on the working of your motor and know the condition of the valves or rings for sealing ...
I usually do the static check when I clean or change out the plugs,,, AND write it down and date it in a log book...(I have yet to do what I preach about the log book)
signed....BUBBIE