No you don't need to reinstall rom. Steps should be (With a clean wipe, dirty wipe ignore the installing rom and GAPPS piece):
I think older versions of the LOS 15 Gamma Kernel (or just the rom) supported 90Hz but as this created problems it was put down to 72Hz
does anybody know how to turn up the DAC volume so it will be more similar to stock on high impedance mode?
i have very low volume on any headphones using LOS 16 with this kernel
btw which version of this kernel should have best battery? 4, 5.0.1 or other version?