I have a few ortho boards, an horizontal staggered one and use a vertical stagger with strong pinky stagger (+ another with light pinky stagger) ; I can type on all of them but I’m now faster on split vertical stagger, and have to look often at the horizontal stagger one when typing.

On a normal board I was at 90wpm before using split vertical stagger boards full time, now only at 50ish but that’s only because I use those very rarely now. It’s a learning experience, don’t feel afraid to be slower, you can relearn anything in no time