Claw v Shred for Bears

[Watto44]

This doesn't say much for the difference between Shred and Improved Shred (more of a When Things Go Wrong™ talent in this situation, IMO - you can shred again immediately if you miss), but speaks miles about the effectiveness of Shred vs. Claw.
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Unfortunately, you forgot to factor in Savage Fury, which would change your maths.

Claw DPS = 1.2(b + 115)/4

So, when b = 50, Claw DPS = 49.5 (vs 48.75 from unimproved shred, and 60.93 from improved shred)
b = 100, DPS = 64.5 (67.5, 84.75)
b = 150, DPS = 79.5 (86.25, 107.81)

Also, by ignoring the damage from combo points you tip the favor towards shred. The logic behind including combo point damage is that claw generates combo points quicker than shred. Assuming 150 damage per combo point, claw gains 37.5 dps from combo (damage/time, or 150/4) points while unimproved shred gains 25 (150/6). While this is a static dps increase, it also increases the "cross-over point" where base damage generates the same dps for both moves.

Not saying I disagree with you, because I don't. Improved shred is definately the best DPS combo maker that a kitty has. However, if you haven't invested in improved shred but have maxed out savage fury then claw may very well generate better dps for you. If you have both talents, it's worthwhile playing around with claw on trash mobs to see which generates more dps.