I personally wouldn't change every single compound in my cycle half way through. How are you going to know if you respond well to those compounds and dosages if you look back at your cycle and can't even really say that you gave the compounds a full cycle to see how it went. Of course, theres nothing wrong with changing compounds, its your own preference. But doesn't this complicate things in the long term? Its strange that you want to bulk up but you went with tren/mast mix with winstrol/anavar (the most common and effective cutting cycle known to man), and now you're looking to change to tbol/npp which is also a (less common) cutting cycle. If you want mass, you want deca. NPP can do a similar job but still, I feel like you don't really know what you want or you didn't plan things as well as you could. Or maybe you aren't getting the results you want (probably because you're bulking on cutting compounds) so you want to change up the drugs.

I would say eat like a motherfucking horse and keep the current compounds. You can gain great mass on tren and the mast will be the cherry on top.