A pot cost system that actually makes sense

My reasons for the changes are more to balance the HP pot usage between melee and ranged classes. I'm a little surprised that the major point of discussion became how this affects mages. MP pots were added as an afterthought because I really don't give a pineapple about mages and their ultimates, or the whole argument about leeching, but I wanted to include them.

I do like the asymmetric healing idea; Magic Guard makes potting pretty confusing the way it is now.

I'm wondering what mages do in KMS. Can anyone who has any experience with the matter explain if leeching is common, or if mages train with ultimates at all?