What are the bad side effects you're experiencing?
at 350mg/wk of test with the addition of mast (which, IIRC, has SERM like properties in helping to reduce gyno symptoms*), you may not have a problem at all, but then again, you just might. The only way to know is to try it.
*This doesn't mean you can replace an AI or a SERM with masteron, lol, but just sayin'. Plus, estrogen has more nasty sides than just gyno.