There has to be something wrong for it to detonate with a tune. Regardless of your compression ratio, when you tune a car it was not detonating at that point so the question then becomes what have you changed. I'm assuming that the throttle body and the manifolds were changed out prior to your tune.
Have you inspected the spark plugs?? I would start there to see if any/all of them have any fouling, carbon build up, or signs of detonation. If someone had an engine scanner they could determine which cylinders were having pre-ignition and see what fault codes were showing. I had a differential pressure sensor go out on my mustang which made the EGR valve fail open which ultimately cost me a motor in hte mustang. Alot of times a code scanner is the easiest way to get down to the root cause.
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