That seems weird on nova.
The idea with aerospray is to give it some fighting capability. Right now, it's one of the shortest range weapons in the game, with a 5 shot and worse accuracy than nova. As a result its effective range for fighting is shorter than dapples, and that weapon has rolls to get in with. giving it perfect accuracy only during jumps means it's still a low accuracy weapon, but can have good accuracy with a tradeoff. in this case being that your motion is very predictable until you land again. So it won't be a fighting weapon, and it'll still have wide shot spread for painting if people want to use it for that, but it'll at least have some options for if it does want to fight.