It would not be wise to take winstrol now. Save it for a future cycle. You gained weight because dianabol, deca, and testosterone all cause weight gain and water retention. You'll lose the water weight when you come off the cycle, but 8 weeks on oral steroids is a bad idea.

You are much, much better off saving the winstrol and using it in a cutting cycle in the future. If you want a six pack, it's not going to come in 4 weeks if you don't have visible abs right now, unless you lose a substantial amount of muscle as well.