If you're gonna nerf Heimerdinger's R+Q...

...then make Apex Turret (R+Q) immune to displacements and increase its rate of fire from 1.05 to 1.50. And tweak those beam numbers to 125/200/275.

Additionally, buff HEXTECH ROCKET SWARM (R+W) AP scaling from 183% total to 200%.

That will put the changes in the right direction.