The general answer is that the value for stasis is better than the value for casting the item... your output doesn't tell us the HP/MP restoration values (or whether you've gotten those set properly, either by using Bale's UR or manually) so we can't directly validate how much it's considering each point of MP to cost, but...
Basically, step one, validate you do have _meatperhp and _meatpermp being set. If you don't use UR, there's directions above in this thread on how to manually generate those during your login. These are needed to decide how much your casts cost, as well as to decide how much to prioritize stasis healing.
Step two, if you still care and want it explained... turn verbosity to 9 and paste from beginning of combat until the first round of stasis actually begins. That gives us the consideration of stasis, the familiar consideration, the items, all that lovely stuff.