Multi Level Spells
If a Shek-Pvar knows how to cast "Maintain" at level 2 with an ML of 80 and then develop a new version at level 3, he opens it at a lower level : say ML 40 for example.
From that point, if he wants to cast maintain on a 2 lvl spell, he casts it at 40 and not 80 as before.
It seems strange to me :
Masterising a more difficult version of a spell implies becoming less proficient with less difficult versions ?
I would rather conserve the ML of precedent versions and apply it when relevant.
What is your opinion about the logic behind the mecanic ?