running more deca than test is fine.. bunch of bro-science that you NEED to have a 2:1 ratio of test:deca (same with tren.. while we're on the topic).
npp mg per mg will give more actual hormone than nand deconate, and the physical effects are much different, appearance-wise.
the npp ester will allow you to do only 2 injections per week. IDEALLY, you'd shoot EVERYTHING everyday... and IDEALLY, you'd shoot npp 3x/wk, but it's perfectly ok to do only 2 injections. say, on a Monday and a Thursday. tricky part is finding a properly dosed NPP product that will allow you to get all your npp mg's into 4 injections (assuming you do 2 sites, twice a week), and hopefully your stuff is ACTUALLY 100 or 150mg/cc, that way, you can do 3-4cc of npp/injection day, leaving 2-3cc's for test or masteron or something.. or tren.. whatever.
IME, 600 is where npp starts.. I'd say hit 800 and see how you respond, bump it to a gram if you can afford it... running that with 500mg test is fine.