To my knowledge, the studies that found Trenbolone to increase circulating IGF-1 levels also included Estradiol. So a product like this was used:
https://www.merck-animal-health-usa.com/product/cattle/Revalor-S/1
120mg tren ace and 24mg Estradiol.
There are some studies that look at Trenbolone administration alone, but these only look at IGF-1
mra expression in muscle tissue, not at circulating levels.
So if I had to take a guess as to why so many tren users have shown reduced IGF-1 levels in their blood tests: tren is such a powerful androgen that it severely reduces estrogenic activity in target tissues. So their Estrogenic activity was too low, which in turn decreased liver IGF-1 output.
In case of OP, he runs a 'high' dose of tren and in addition also an aromatase inhibitor. I'm fairly sure he is miles away from the 125/24 tren/estradiol ratio used in the animal studies. People need to keep their Estradiol up when runing tren to make the most of it in terms of growth.