Thats similar to what I am doing right now except I ran test prop at 300, NPP at 400, and tren A at 500 for 8 weeks now for the last 8 I subbed out the NPP for mast at 400 a week. When I dropped the NPP I did notice a pretty big drop in water retention. I did not have a lot but I do believe the NPP does hold some water on you nothing like its older brother Deca but it still does. I run the NPP to keep the joints happy I am 41 and have been banging away at the iron since I was about 28 so I need it.
Like the earlier poster said mast bind to SHBG so you can actually get more bang for your buck. I did notice the night sweats and insomnia and heart burn increased when I added the mast so I know its working. So my 500 tren feels like 700. Might increase the mast up to 600 and see how that feels.