In terms of a “short cycle” deca isn’t going to be your choice. You would need npp for that if your stuck with a 19-Nor. Also from the OP it seems like you have 5ml of test and 5ml of deca.. that’s gonna get you nowhere bud.
Again if you’ve made up your mind none of this talk matters and it sounds like your just needing someone to validate your cycle. No. You decide. Get the research and know if it’s what you want.
IMO start hitting legs hard. Cardio is icing on the cake. If you want to grow your body work it all out not just what your wanting to grow which appears like your arm size.
All I’m trying to say brother is a good meal plan and a good workout program such a Dogg crap, FST-7 or pretty much any John Meadows program would get you there.