I have never heard T3 has a DIRECT impact on lowering prolactin levels or that tren downreg thyroid . - who told you ???
Are you talking about Tren Ace or Tren Prop???
(I will get clarification but first,)
Tren will increase prolactin so I run my tren cycles with dostinex/cabaser/cabergolene
.25 M, TH for 2 weeks,
.5 M,TH till the end.
If this isn't enough you can do .5 M,W,F which seems to be the sweet spot for inc prolactin as a result of Tren.
I run T3 up to 100mcg but not for long. Usually I stay at 50mcg T3.
This is what I have found to work and am not recomending this for you.
Responsibly I can't rec. anything since we're all variations of Carbon.
Life