Ok, then leave Iron Will.
I could agree to shrinking the ranges in the CR table, too.
Let's see, a Standard Lycanthrope has:
1 HD or 2 HD, +2; 3 HD to 5 HD, +3; 6 HD to 10 HD, +4; 11 HD to 20 HD, +5; 21 or more HD, +6.
Maybe give it a cumulative -1 HD shift at each stage after the first?
1 HD or 2 HD, +2; 3 HD to 4 HD, +3; 5 HD to 8 HD, +4; 9 HD to 16 HD, +5; 17 or more HD, +6?
Dire Ape CR 3 HD 5 -> CR7
Dire Badger CR 2 HD 3 -> CR5
Dire Bat CR 2 HD 4 -> CR5
Dire Bear CR 7 HD 12 -> CR12
Dire Boar CR 4 HD 7 -> CR8
Dire Lion CR 5 HD 8 -> CR9
Dire Rat CR 1/3 HD 1 -> CR2
Dire Shark CR 9 HD 18 -> CR15
Dire Tiger CR 8 HD 16 -> CR13
Dire Weasel CR 2 HD 3 -> CR5
Dire Wolf CR 3 HD 6 -> CR7
Dire Wolverine CR 4 HD 5 -> CR8
Hmm, the Ape, Shark and Wolverine seem too high. I think I'd better tweak the second lowest and highest ranges.
How's this?
1 HD or 2 HD, +2; 3 HD to 5 HD, +3; 6 HD to 9 HD, +4; 10 HD to 18 HD, +5; 19 or more HD, +6?
Dire Ape CR 3 HD 5 -> CR6
Dire Badger CR 2 HD 3 -> CR5
Dire Bat CR 2 HD 4 -> CR5
Dire Bear CR 7 HD 12 -> CR12
Dire Boar CR 4 HD 7 -> CR8
Dire Lion CR 5 HD 8 -> CR9
Dire Rat CR 1/3 HD 1 -> CR2
Dire Shark CR 9 HD 18 -> CR14
Dire Tiger CR 8 HD 16 -> CR13
Dire Weasel CR 2 HD 3 -> CR5
Dire Wolf CR 3 HD 6 -> CR7
Dire Wolverine CR 4 HD 5 -> CR7
That second CR adjustment looks OK to me.