One idea that's been floating in my head is the concept of anti-magic scaling. This would be where for every few levels you gain in any way, your anti-magic skill also increases. It seems like it would make sense, since your knowledge of the Ways would also influence your knowledge of their weaknesses and ways to negate them into little to no damage. To make it simple, it wouldn't "tilt the scale" based on whichever Way you've trained, so that if you have 100 DW, you'd only know how to negate DW spells, but since inherently casting magic is all the same concept, you would have small knowledge on how to negate all of the Ways, and this would increase the more you train and the more diverse your magical abilities are. If you're a master of every single Way, then there isn't much training left to do in anti-magic, but if you've trained where you want to be with specifically DW or RW, let's say, then you could still go for individual training in just anti-magic for defensive purposes, but otherwise, these defenses would scale with how strong your offensive skills in magic already are.