To answer your question about MSR tweaks read about it on XMRig as they explain it very well, secondly MSR tweaks can only be done as root and is for CPU's only.
So SRBMiner-MULTI and XMRig have to be running as root to make use of MSR, and bytheway you forgot to mention whicj linux distro you are using.
As for the dev fee pool issue it's probably on your end only as otherwise there would be way more people complaining about it.