Small Vel'Koz buff.
Vel'Koz isn't in a bad spot right now. His winrate is fine at 53% but he has a low play rate at about 2%. Which is why I'm proposing this small buff. Increase the duration of the suspension from his e. Preferably by .25, from .75 secs to 1 sec, maybe less. Currently enemies hit are suspended for .75 secs. Plus it's highly unlikely that you'll hit more than 2 enemies with his e so a small duration increase should suffice.
Sounds cool?