I wouldn't bump/degrade at all.
What I'd do is have success by levels. That would then determine any success-level-dependent results.
Criritcal vs Fumble = Succeeds by 4 levels
Critical vs Failure = Succeeds by 3 levels
Critical vs Normal = Succeeds by 2 levels
Critical vs Special = Succeeds by 1 level
Special vs Fumble = Succeeds by 3 Levels
Special vs Failure = Succeeds by 2 Levels
Special vs Normal = Succeeds by 1 Level
Normal vs Fumble = Succeeds by 2 Levels
Normal vs Failure = Succeeds by 1 Level
Failure vs Fumble = Succeeds by 1 Level
For opposed roll victories based on highest roll/greatest margin
Critical vs Critical = Succeeds by 0 Levels
Special vs Special = Succeeds by 0 Levels
Normal vs Normal = Succeeds by 0 Levels
Failure vs Failure = Succeeds by 0 Levels
Fumble vs Fumble = Succeeds by 0 Levels
It's quick, easy and you don't need mental gymnastics to degrade rolls.
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