As long as you keep prolactin in check, it's probably not a big deal. I would suggest a lower test dose with it as well for lower aromatization. Other than that I don't see a problem, especially considering the Tren dose is on the lower side
since you are on HRT anyway then its totally fine.
deca is a mild steroid that gives a feeling of well being and tren is extremely androgenic and anabolic so its a fine mix. I wouldn't stack tren with something extremely potent or harsh ever.
Its an outstanding combo. The best injectable combo I've used. Throw in a little mast and your golden, and of course the hrt test dose. Dosage will depend on experience with both. Start low and adjust up. I'd start at 200 mg each and go from there. Its gonna take a good 6 weeks for them to really take off then you can start adjusting weekly. If you wanna get harder and leaner up the tren and mast. If your wanting to get fuller and combat some of the drying out, more decca. If you really wanna take the hardening and vascularity to an extreme level add in some winny on the back end.
With test that low you won't need much caber at all. 0.5 mg once a week or two will suffice. I'm not a fan of just taking shit just to take it. Use it when and if you need it. Pay attention to symptoms and base your dose and frequency off of those.