1) If you rock those songs as hard as you can on an acoustic, they'll even be more bad-asserer when you switch back to electric.
2) Why are you running acoustic anyway? Does your amp shut down if the drummer doesn't show up?
I don't know. Some of the other members talked about doing an acoustic show someday and I was just sticking it out giving it a try before just saying no. It really does help with finger strength though after going from acoustic back to electric. It makes it feel easy.