Small Vel'koz Tweak
Just something to mention as a way to tweak Vel'koz in a manner to make his late game scalings have a little more potency. Taking a little of his base damage out of his passive and adding a minor scaling (.2 or .3) might give his rotations a little more oomph when he builds large amounts of AP.
For example: Landing his Q+W currently has a ratio of .6 and .62 for landing the entire combo- would be bumped up to a .7 and .7 (ish). A decent scaling ratio for a midrange poke-mage.
Another example would be it could bump the .6 ratio on his ult for the entire duration to a .8 or .9 (with potential to be even higher with previous stacks or additional stacks after the duration of the ult).
Overall it can be something that adds a little more scaling into him and allows game balanced to have more clear numbers to tweak.