75%/hr on 1x isn't impressive at all. I would suggest Truckers til 48~50, then move on to mp3. Arans are so overpowered they can go that early.Level 45-52: 1 point on Combo Drain, Max Combo Smash
Level 1 Combo Drain should remove the need for using HP potions in the training areas at this level, which for the time being should be Lab C-1 in Alcando Lab, Magatia. You should have no issue hitting Roids/D-Roids at level 45+ and you should get about 75%/hr on 1x experience.