You can definitely add in some winny towards the end of the cycle. It would be a good choice for the polishing of your cycle.
As for the recommendations with winstrol, I have 4 recommendations:
1. Winstrol is liver toxic, no matter if it is an injectable, or the oral version. Therefore, either take the oral, or just drink the water based injectable. Besides, the injections can be quite painful with it.
2. The optimal dosage is 50-60 mgs per day.
3. Since winny is liver toxic, you need to use a good liver supporting supplement with it. N2Guard is the optimal choice, as it is probably the best liver supporting supplement on the market.
4. One of winstrol's side effects are dry joints, which may cause joint discomfort. Therefore, I would recommend stacking with it some joint supporting supplement, such as N2Joint RX.