Cornering with Johnson Legend is hard

Guys pls help me.

As you might guess, I'm suffering from success 💀🤡.

Using Johnson to circle around the corner towers (outer turret) is hard. I crash into the wall that has the firefly creeps. I'm trying to learn how to check bushes while in ult without crashing.

And I've noticed that the towers are not in the perfect centre. The outer turrets are closer to the wall so It's tough for me to squeeze through them 🙇🏻‍♂️