To switch between windows of the same app, use Cmd-`
The backtick thing is just a constant annoyance. My workflow is to open windows doing the things I want some, and I want to quickly switch to the window with my next work item. Instead, I need to keep track of extra mental state and figure out if backtick is the right keystroke or if tab and then backtick is the right thing to do.
It's...fine. I'm thankful I have better options at home, but it's tolerable at work with a few third-party apps.