Hey whats up Im 25 year old male, 185lbs. with about 11% body fat give or take, I have been lifting for about 3 years. I am currently in the middle of week 4 of 10 of this cycle

dbol / 30mg/ed (week 1-2)
dbol/ 50mg/ed (week 3-4)
Test cyp 500mg (week 1-10) inject on sun and thurs
Decca 400mg (week 1-10) inject on sun and thurs

I have hcg and nolva on hand for pct, my question is would I be jumping the gun if I added test prop and winny for week 11-15 then pct week 16-20. I want to keep most of my gains and I have been researching this and im getting some people who say that adding winny and test prop would help keep me lean and keep more gains if i used this at the end of the cycle. I need help ASAP!!! what sould I do? And if it is cool to use the test prop and winny what dosage should I do. Both will be injectable