I don't think I should be giving any Nova advice since my Nova is ass.....well I'm garbage with everyone. Plus the way that I play relies on constant shenanigans. But I don't think anyone has said this yet, and it's something that I do that works 9/10 times. When I box dash H, I usually fly once the H hits, whether it was blocked or not, and then I do another H while I'm flying and then input nullification with H. One of those fuckers are hitting. Plus I'm using Felicia for the unblockable, but it should work with you since you're using drones. It's the same shit you'll see anyone doing with Mags, Doom, or Iron man, but for whatever reason you don't see it nearly as often with Nova, which is a shame because he starts flying so damn fast. I don't know how well this works outside of the corner. Oh and I use qcf+H a LOT. It gets me out of shit quite often since it stays there for a while. And I like to use it in combination with Vajra and javelins....many characters have trouble moving.