I need some stun slam help

So ive got a question about stun slamming. Ive always learned the game with my pointer finger on left click and middle finger on right click. Now for stun slamming I need too double click so pointer and middle both on left click. Do I use my windcharges and pearls with my ring finger then? Or do I exchange my middle finger from one side of the mouse too the other when im going for a stun slam? I'm having a really hard time with this so I need you guys' help