First off, Fina is also a Class I and Class II Anabolic, it falls under both categories just like testosterone. Second, Tren related gyno problems are usually due to elevated prolactin or IGF-1 levels not progesterone, even though tren has a strong affinity for the PR receptor. Now, adding nolvadex and possibly bromocriptine will help with Fina gyno on both the prolactin and IGF-1 fronts, and as long as your deca dose is below 500mg you wont have to worry about gyno. Your biggest problem is going to be the your complete lack of sexdrive because the progesterone will boost libido immediatly, but it will eventually destory sex drive. I suggest throwing in a healthy dose of testosterone, and you will be fine. So in conclusion, yes you can use Tren and Deca together, add some test and you have a nice combo.