Stewart Campbell

So I just finished building a TT bike and I was dialing in the rear derailleur.  I run a wide range of cassettes and have to adjust the B-limit screw a bit.  My training cassette is a 27T but my main cassette on my TT wheel is a 21T.  The B-limit screw all the way out is only allowing the upper pulley get close enough to a 24 or 25 T size cog.  
It appears to me that it is just the design of the hanger not allowing me to adjust the B-limit screw all the was down to a 21 or 23T size cog.

I know that it will not be that big of an issue, I was just wondering if anyone else has seen a hanger that has caused these issues.  I would assume that all hangers are positioned the same, but I guess not.

Thanks,
Stewart