ShiKage's Infighter Build

Since typhons hit pretty low compared to say himes, I would say Blast when you have Charge at ~10, and do a switching of 1/2 and 2/1 on the skills. If you think youll go to another training area before 120, then start adding drain when you have Charge and Buster at around 30/20, otherwise you can add 5~10 points to Drain and have the switching be with Drain and Blast til it is at a lvl you want to leave it at for the time being. At 106, I found Drain 8 to be very effective for training/killing HH in around 10 mins.

So when should I consider xform or stun mastery? Or are those not very effective for training purposes?