Possible solution for Rengar?

Okay, so I am a Rengar main, and while I love the champion, I think he is quite overpowered despite being reworked shortly after his release and nerfed not too long ago. Especially with Glimps of the Void, the Infernal Drake, and the Cloud Drake being a thing since the mid season patch. However, I've thought of a way to nerf him so that he'll still be able to do Rengar things, while at the same time not being quite so overpowered. Here's my idea: take away Rengar's ability to crit with his Q. Because if you have an infinity edge on Rengar and manage to land a crit with his Q, you can easily deal around 1,500 damage if you're at full build and are at level 18. And even if you crit with a regular auto attack, that's still 1,000-1,200 damage. It's fine if his Q can still apply on-hit affects, but when you think about it he doesn't need crit in order to deal stupid amounts of damage. I've experimented with both crit and standard assassin Rengar, and to be honest, he doesn't really need crit chance whatsoever. I just want to hear you guys' thoughts on this.

Edit: Allow me to rephrase what I said. I am aware that Rengar's Q can't crit. What I'm refering to is Rengar's ability to crit with the bonus damage from his Q being added on top of the crit itself (since his Q technically counts as a basic attack). Sorry for the lack of clarification. What I'm suggesting is removing Rengar's ability to crit while his Q is active, or in other words, making it similar to Ezreal's Q.