Started playing this game on my keyboard. I was a tank. Zutvan came out. My hands got destroyed. I really wanted to clear the fight, but I didn't want to get carpal tunnel.

So I got a controller, learned to play on that. Never went back. Years later, I decided to learn how to play healer (AST, even). It was great.

One day my controller's trigger button stops working. I decide to try learning how to heal using mouse and keyboard. On that day, I realized how sorry I am for every single healer in this game that doesn't use a controller.

Use a controller. It will resolve all the issues you brought up in your post.