As far as I know 11.0 locks you out of downgrading as well as makes launching the exploit very unreliable to launch.
Link:
http://gbatemp.net/threads/11-0-0-33-the-aftermath.426100/
So no, don't upgrade. I would say get CFW set up if you want more reliable access to the Homebrew Channel and want to play online as well.
Use this guide if you decide to go down that path:
https://github.com/Plailect/Guide/wiki
If you don't want A9LH, and want only rednand+menuhax, just stop at Part 4 Section I step 28. That way, you have FBI on your emuNAND/RedNAND. The FBI injected is just used to have an entry to install your initial .cia manager, so just install DevMenu//BBM through it after that and use that for your .cias installs, and you can keep the inject FBI as backup on your emuNAND//RedNAND.
Though I suggest you just do the whole guide.