30mg is plenty. I used 30mg dbol w/200mg deca and went from 188lbs to 210 lbs by the end of 4 weeks. No side effects whatsoever! Huge strength increase, little bloatness.
Drink a lot of water and yes, liver detox should be taken.
As far gyno, it is very individual, some guys will never get it and some will, there is no set rule for that.
If you can, take 5mg every 4hrs. if not, 10mg every 8 hrs.