umm you do realise that rakeback is a fixed % and hence the more rakeback you get (proportionally) the more rake you are paying, right?
okay so if the rake is dealt then the best way of 'maximizing' rakeback would be to sit at as many full ring tables as you can and try and breakeven while being as nitty as possible, but a slightly better idea than that is to just play the game you're best at and can make the most profit from ignoring RB.