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I'am having trouble running higher than 15 psi as well. It revs easy through the rpm band all up to 7K, but anything more than 15psi and it knocks. The safeguard takes care of it, but its annoying anyways.
I run up to about 24 degrees up to 15 psi iirc, but need much more retard per psi after that, and even then it still pings but I am still experimenting at what retard it doesn't ping anymore. I now have water/meth injection and it helps a bit but not as much as I hoped.
My conclusion for MY set-up: my turbo/turbine is too small: it creates too much back pressure and also the compressor gets out of it effeciency area: at 1 bar its probably in its 70-75% efficiency zone, but above it gets probably to 60-65%, creating more heat when compressing air...
FWIW..
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