Personally I use Proviron at the end of cycle to keep gains and hollow the body to produce again LH and FSH.
Proviron,only if used alone at dosage range 350-500mg/week,doesn't shut down the LH and FSH production.
So,while you keep gains of your cycle,your body produce again LH and FSH and when you stop prov your test level will be almost normal and you can keep your muscle!!
So in your case:week11-12:50-75mg/ed;week13:25-50mg/ed;week14:25mg/Ed(if you previous used 75mg and 50mg.)