Nilbog, if it's not terribly complicated, would you consider having this chance to interrupt scale linearly as you get hit wherein an internal counter resets on either spell interrupt or spell completion through random distribution?
For example, if you need to make a 90% chance roll, the initial hit during a cast would have a 1.5% chance to interrupt, the second hit 3%, then 4.5% until the spell is interrupted or completed where the counter resets. This gives you an average number of attacks of 10, no different than a roll but much less vulnerable to lucky/unlucky streaks. It's a lot more stable of an output than just a roll, and doesn't result in massive streaks.
I think this will have a much better desired effect on the gameplay than a roll on each attack. Not opposed to the idea of fixing channeling in this manner you suggested, works but a fair bit blunt.
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