Detune and weight gain? Is it over the CSBK HP limit and under the weight cutoff?
Apparently you have to use a stock battery too, according to the rulebook.
I might pull the engine from the SM and check the crank for runout / rod play, port the new head and properly set up all my clearances and squish since I rushed the build last time. Might put in a new CP piston, I'll have to see how the current one looks after one season.