I had updated to 11.4 on my n3DS and is set with Luma 7.0, and while HBL worked, various apps for it would not. It wasn't until I renamed my 11.3 payload that I kept on my card to 11.4 (and whatever numbers that followed for my version) did I get these non-workable apps to finally work.
However, with 11.4, Luma 7.0, and that working payload, I have not been able to set New 3DS CPU to anything below L2 (meaning I can't set to Off or Clock, only L2 or Clock+L2). Switching back to the newer 11.4 payload would allow me to set to those other 2, but of course the apps wouldn't work.