Although you didn't give your past cycle history, the general consenus on winstrol the dosing of winstrol is about 75mg every other day. With Stan QV 100, you have 2000mg of of winstrol, so I'd probably just use 50mg every other day for 40 days. This way, you still have 1000mg left for a second cycle. So assuming this is your first cycle by looking at your original post:
300mg Deca: Weeks 1-10
50mg Winstrol: EOD for last 40 days
If you're concerned about 'deca dick,' a rule of thumb is you should run at least as much test as deca. So, you may want to look into getting yourself some test cypionate or enanthate with at least 250mg a week. Since your goal is to get cut and not add much mass, you may not want to use any more than that.
Good Luck
cydex01