id go with shearers or cpis for the cuby i had t5s and just seemed like they were choked down. and you should be alright with yout carbs brandon at wildcard sells a sweet intake i just picked one up that puts your carbs at a angle to miss pipes works good with shearers
ported? you could get away with prolly 3hd springs or maybe all 6 my 392 cub did just fine with 3 hds no slippage i would get some different pipes for sure your only hurt performance with those on a cub imo
if ya dont have hose bewteen the carbs it wont run right at all comp that low im surprised it starts. but if they are shorter it wil read about 10 psi lower. and why are you running with b9s? a stock motor should use br8es
were the threads on the comp tester about the same length as threads on the spark plug. that is pretty low comp.specially depending on your elevation. I believe at sea level you want around 120 on a stock motor and im at 5000ft a good stock topend gets about 100