Test/deca cycle question?

Hey guys, I have done 400 mg.T400 and 200 mg. deca wk. with decent results. I am thinking of Test cyp. 500mg. and deca 200 mg. wk. next cycle. I know the deca is low, but if I go with 300 or 400 mg. will it make a noticeable difference? Only have piece of shit 100mg. deca is why.

I think going to 400 mg of decca would make a big difference.