[Dominik]

Sorry, if I repeat someone, haven't read the whole thread:

A thicker gaskets may actually have the opposite effect in offsetting the desired quench area resulting in a worse flame travel (assuming it's not a hemi head).

A long duration cam helps at part throttle, but it's unlikely to rectify knocking at WOT.
There you could retard total ignition (at WOT).

To reduce (avoid!) detonation at part throttle play with the timing curve (weights). I strongly suggest to get someone on a chassis dyno to assist with the timing curve.
You can hole your pistons in seconds.

Also, if your car is light and has a short (numerical high) rear end, it will accelerate through part throttle faster reducing duration of knocking.

Keep an eye on A/F ration (air/fuel) too.

I ran 12.5 to 1 on german 98 RON octane which is about your 93 MON with a 2000lb car and 3.54 to 1 diff. It was weather sensitive...

If all the above fails, mill the piston domes off. Ask the piston manufacturer for min head thickness, or get a new set of pistons!

If your cam is matched to the 11:1, change cam timing a bit (advance?) Speak to your engine builder.