Honestly, you're not lean enough for the masteron yet. You won't get anything from it and thus it will be wasted. You'll want to START using it when you're at 10% or less.
The test injections should be ED or EOD, don't dose it the way you have laid out unless you want unstable and flucuating hormone levels. ED is best in my opinion.
Your diet is the key to change. I've said it a thousand and one times now, DIET will get you further than 3g of gear. DIET controls everything. DIET will make or break your goals. DIET is better than anything.
DIET, then training, then cardio THEN AAS. IN THAT ORDER.