Someone please tell me it gets better using a Riffmaster

I have all but mastered Festival on controller but for the life of me cannot come anywhere near close to perfecting any pro lead/bass charts with a difficulty ranking of maybe 3-4 out of 7, or higher. My riffmaster roughly 50ish playtime hours in has quickly become a source of severe frustration. My brain and fingers simply cannot seem to be able to process notes quickly enough. It's the like the second there's more than 1 note per second I just freeze up. It's super discouraging. Help.