I have a similar system. I have a hard time remembering lyrics until I type them out and then create similar cheat-sheets.
I sing a lot of lead and backing vocals, but I have a really hard time improvising or adding to vocal lines while playing bass. I have to remember where in the bass line each phrase starts, which is limiting. I would love to be able to perform as freely as a vocals-only singer, but I feel naked when singing onstage without my bass (and no one wants to see me naked...).