I don't know ... but in diez if you want to do some decent damage u'll need all the mp you can get so I would go full mp ... = 247. Cause light already hits lower than fire and most of the rouges have rols/legionaire band which gives even more lr than fr.
Maybe ask pipolito , he is half mp and half hp I think. Or bfd , bfd is full mp I think. And when BFD pk's he gets a lot more kills than pipo... but pipo is +- support too.