Partial agreement, leave a week's gap between the Dbol & Winny to give your liver a little break - they are both 17aa and 12 weeks non-stop will be a bit like going out drinking every night for 84 days!! I would reccomend starting the winny in week 7 and perhaps doing just 25 or 30mg of Dbol up until 4 1/2 weeks.
Also, after all of that injecting, you could avoid internal neddle scaring by drinking every other winny shot - as the digestive system will hardly affect the 17aa construction of the winny.
Good luck.