Since you have ToB installed, dual into your thief after your Kensai hits 13th level. You get one extra attack per round. If you are dual wielding it takes you from 7/2 attacks to 9/2. (That's 7 attacks per two rounds and 9 attacks per two rounds.)
With ToB installed, you can definitely achieve your maximum thieving skills. You might not reach 40th level, but you'll be up there.
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