mouthonpenismakesithard

hi guys, first time on this site and looking for advice.. im doing a 12 week corse of primo, anavar and growth. primo 400mls per week var 40mg per day growth 3ius 5 days a week im on week 8 now and im finding it hard to 'get hard' down below. should i tro in 200mls test for the last 4 weeks or...