Have you tried resetting all the steering adjustments the Transmittter can make? I know with the Futaba 3pk that I use there are a number of different adjustments you can make other than End points, like dual rate, that could have an effect!
I have used the 1258 in a B44 and B44.1, both with the standard linkage parts, and it's never had an issue reaching full lock when it's set up right!
That said, you can adjust the end points beyond 100% normally...have you tried that to make sure your getting full range?
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