Advancing your cam usually increases your cylinder pressure! Advancing your cam also tends to lower your peak hp rpm. Again try it straight up. I wouldnt be too worried about 11:1 compression with aluminum heads and 92-93 octane. There's a lot more to detonation than just cylinder pressure.The KRE chamber is good!
Before you buy another carb put a vacuum guage on and see what you have for vacuum at full throttle 6000 rpm. If less than 1 inch (like .5-.7hg) you have enough carb.
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