Help me out here,I'm 29,5'10",160 lb's,very little body fat.

I'm doing 30mg/day,split 3 doses/day,6 week dbol only cycle.

I'm training hard/heavy 3x/week,using milk thistle and eating big.

If I do good pct,how much of my gains will I probably keep?

I say bloody truth because I'm being told different things by different people.
I'm being encouraged to inject test which I understand and respect as an opinion but at same time I'm weary as I've read so many times,first hand experiences that alot of guys do keep their gains fine.

Help...