You already have a solid steroid stack, using 4 different steroids. Prop/Tren/Mast is the most popular stack for competitors, but steroids alone aren't going to get you ripped. With gear or not, its all about your diet, and in addition to that, your cardio plan. If you don't have this dialed in, it doesn't matter what else you do. And if you have a lot more fat to lose, it is going to take time. If everything is dialed in, and you are doing the work you need to do with your diet and cardio, clen would add much more to this program than an additional steroid would.
I would start at 40mcg and increase by 20mcg every 2 wks, going no higher than 120mcg and staying on clen for no more than 16 wks total.