It still is to earlier to conclude, but it seems now the battery doesn't drain as it used to, probably the problem is fixed, and it boots on latest baseband from BQ M5 original firmware 5.2.0 (Nougat Update)
https://mega.nz/#!0wwzFC4C!WrPV7-Cp1...zG8ilYmOhF4jYw
So hopefully my initial feedback is not wrong, I see a improvement here on this new updated rom.
Also the kernel from RR roms which are bootable with the new recent Basebands from BQ are double the same (9 mb against 18 mb) if you notice it.