To reach the cast speed breakpoint I MO'd cast speed 3 times. Now I could have done spell focus but I'm already capped on that from other pieces, so it wasn't necessary. In addition (this could be improved) I just socketed 3 vex runes. In an ideal world, I'd have a variety of jewels that have cast speed/spell damage/spell focus mods. The QoL from mind rake is fairly large because of the regen and LaeK. The spell damage and +skills would be difficult to find on another weapon.