True, using anything other than lvl 3 missiles against neutral Venom is a bad idea. The purpose I had in mind for the missiles is to force him to FD your missiles while he's setting up his balls.
A really good way to deal with certain ball setups is to 2k under them, but a lot of the time that won't be possible.
If you have a lot of finesse, you can just use 6hs, 6p, and 2k to negate and go around the projectiles, but what I'm getting at is that the attempt is to make Venom stop making balls for any amount of time.