15 weeks is a long time to be cutting. You've likely stalled as RTFT said because your cortisol is high. Instead of throwing more drugs in the mix, up your calories to maintenance for 4-6 weeks and up the cardio. Your HR should be getting up to 140-160 for optimal fat burning. Incorporate HIIT instead of steady state cardio.
Your abs and obliques are very underdeveloped as well. Start hitting them 3x a week so when you get lean down the line they show. They are just like any other muscle, you have to target them with progressive overload to stimulate growth. The guys that say you dont need to hit abs because you hit them with compound lifts are all under 5'9 and have a short torso.
After this is done, throw in anavar at 100mg to finish off the cut and polish up your look. Tren is only for the most advanced users and is not like other anabolics. It will fuck up your life if not handled correctly as you can see by the countless posts of people asking for help because they thought Tren was something to be taken lightly.
I'm in my 20s, fairly advanced and even I don't touch that shit anymore.
Man, you hit the nail on the head. 15 weeks is a huge cut, and I totally agree anavar during a cut. I will say though, I'm one of those guys that has never trained abs because there's no need, but I'm 5'11". My abs get sore just from doing pull ups, so maybe I engage them without realizing during multiple lifts, but I've had deep ab cuts my entire life.
OP, rauwolscine is an incredible fat loss aid. It's a natural supplement derived from the yohimbine plant that not only gives a ton of energy and aids in lipolysis, but also binds to certain receptors so your body can't distinguish between adipose tissue on the torso or anywhere else. The body generally prioritizes holding onto bodyfat on the torso, especially the stomach, as it burns fat at your extremities first, but rauwolscine forces it to burn fat equally across the body.
I take it right when I wake up, do some HIIT, then fast until lunch. It works like fucking magic. Seriously, it's a game changer.
It also doesn't increase your heart rate or cause the gitters the way something like ephedrine or caffeine can. In fact, it might even have cardio protective properties.
If you're trying to use more PED's to aid in fat loss, I'd just add some cardarine on top of the rauwolscine. 10-20mg per day for 4-6 weeks and you're golden. It'll also increase your cardivascular capacity, improve every metric of your lipid profile, and lower your blood pressure. I'm a huge fan, even without a cut.
Rauwolscine, anavar, and cardarine = incredible fat loss and muscle sparing during steep deficits. The anavar also has a hell of an increase in strength at 100mg per day, but I definitely get sides at the high of a dosage. There's nothing wrong with 40-50mg per day if it's your first time using the var, which happens to be one of my favorite compounds. Cardarine will keep you feeling great while on cycle, and your cardio will be the best it has ever been. Rauwolscine gives you tons of energy, like, 30 cups of coffee or something from a single dose of 3mg, while the anavar makes you aggressive and focused in the gym (when used as a preworkout), so you should smash your workouts with this stack.
The likely culprit in your lack of recent weight loss is certainly the length of the cut, though. I wouldn't blame you for powering through it before going on maintenance calories, as I myself have dropped down to 1200 calories in the past, to hit ridiculously low bodyfat levels. But if you're trying to be optimal, take at least a couple months to just eat at maintenance before cutting again. Totally up to you. It's definitely possible to push through this last stretch, but absolutely suboptimal and much harder than it'll be if you just give yourself a couple months of a break.