User blog comment:Kagimizu/Kha'zix: Adapt and Balance (Kha'zix balance ideas)/@comment-24613667-20140517133445

As I commented elsewhere, changing Kha'Zix's passive bonus damage and evolved Q (isolation damage, base numbers, probably cooldown and mana cost) is really the only way to properly balance him, not making his kit so clunky that he can't kill anything. Isolation's range should be reverted or decreased to 400, at most, and the stealth cooldown should be nothing more than 1.5 seconds, as you said.

I like the idea of multi-use rockets, as I've never been fond of the 3-shot cone, but the additional slow shouldn't be any larger than 40% (I loath 50%+ slows, they may as well be stuns). It would be cool to see ripple-fire rockets similar to Lucian's ult (since Kha'Zix has like 12 spikes total, not 2 or 6), but that requires him to stay in one place instead of hopping around doing damage and getting kills.

And, I'm not a fan of the offensive ult because, really, it just gives him more bonus damage like Taste Their Fear which, again, is why he's so powerful. Plus, if Riot just balances his passive and Q, then they can probably revert his ult to it's previous state (which I'm fine with). Maybe, maybe he could receive a stack of something every time he gets a kill (similar to Rengar's necklace), which gives him bonus damage in some way, that also decays down to 0 while out of combat (the buff can only be refreshed/increased by champion kills, not attacking minions/monsters). This would give players more incentive to play like the aggressive, ravenous hunter that he is and it would be more thematic than just another damage boost. Of course, even that could be too powerful due to the snowball-y nature of the idea, just a thought though.