Prop kick and taper with test e as base is what I would prefer. Nothing wrong with prop per se but you are bulking so if test e gives you a little more water retention who cares. Also, long ester test (test e) actually provides greater nitrogen retention than short ester (prop). So what this means is the long ester test actual has a greater capacity to build more lean tissue than the shorter ester. So get your long ester test as a base if you are bulking. Save the prop for cutting. Watch that estro, to low and your gains will suffer.

12weeks of prop!! you are brave!! or a bit of sado!

Since you’re addicted to pain you will probably be fine with the pip of 12 weeks of prop, I’d do what drock suggested and kick it off with prop but use c or e for less frequent injections. Also probably won’t need that much aromasin since you’re also using proviron. I use 12.5 a day on 1g a week

long ester test with a prop kicker and taper is what I would do if you’re set on using prop that long.. but that’s me, I’m crazy like that ....I mean I like lollipops in my mouth n butter in my ass, call me a pervert but that me ( no- homo )
Watch the ai dosage with bloodwork unless you’re 100% dialed in with that ester and dose
15 lbs expectation mite be a stretch in 12 weeks , would like to see your nutritional plan here
Imo I would suggest rethinking your layout and come up with a smoother way to gain those 15#

Aromasin everyday on a low dose of test is sure to cause estro crash. Not to mention proviron also acts as a mild anti estrogen.