I just plugged in your parameters, and 69.2 grains of N160 gives me a barrel time of 1.74 ms. However, your step analysis shows 94 grains for a barrel time of 1.309.........
You can easily get to node 5 (1.22 ms) with any number of slow burners (from RL25, Magpro, MRP, etc). With 95.5 grains of N160 you'll get around 2900, but the other powders can easily beat 3000 fps. HTH, Dutch.