You'll probably find it difficult to cut to 7% unless you do a few things more. You are already on 200mg of test and so to cut, your plan seems to be just to add tren e @ 400mg with some winny @ 25mg/day. I think you are going to be disappointed.

400mg tren is hardly anything, You are 10-12% right now. It will help you a few % at best and it will take time. You need to start building your total muscle mass which will help in calorie utilisation, upping your test will help on that, do daily fasted cardio, with I believe a higher dose of tren and more winny. I would add ECA and Clen in rotation to help too.

10-12% is too much. So your idea to get to 7% BF and blow up is fine. But I doubt you'll achieve it in a reasonable time without cardio and possibly adjusting your training. I don't think your diet would be too much an issue. I simply think you are taking not enough hormones. That's just me personally.