Not sure if this is related, but I know that in older patches, Fortify Sneak actually made you more likely to be detected the higher you went. That is, at +20%, you're more likely to be detected than at 0%; at 50%, you're more likely to be detected than at 20%; and 100%, you're more likely to be detected than at 50%; etc.
That was fixed in one of the more recent official patches, and it should still work correctly as of the current 1.9.x. However, I've never specifically tested at over 100%, so it may be a different bug altogether and it may still be the case as of the current patch.
If that is the case, Raid -- and you should definitely verify either way before making any changes -- you could simply drop one of those Stealth perks and pick up restoration Dual Casting for that taper fun.
Not sure if this is related, but I know that in older patches, Fortify Sneak actually made you more likely to be detected the higher you went. That is, at +20%, you're more likely to be detected than at 0%; at 50%, you're more likely to be detected than at 20%; and 100%, you're more likely to be detected than at 50%; etc.
That was fixed in one of the more recent official patches, and it should still work correctly as of the current 1.9.x. However, I've never specifically tested at over 100%, so it may be a different bug altogether and it may still be the case as of the current patch.
If that is the case, Raid -- and you should definitely verify either way before making any changes -- you could simply drop one of those Stealth perks and pick up restoration Dual Casting for that taper fun.