lead in radial
What I think Mike is saying is that the lead in "bearing" off the OB, ie 256o is critical, and only allows 15o for the intercept.
The 5o is the permitted descent within the centreline of a published non procedure approach, (ie ADF).
So certainly start the turn at 16o lead in, and assuming you are at the correct heights on the profile, the start of the descent is within 5o. Remembering slight dip error on a ADF neadle display in a turn, a slightly earlier turn would not be a major problem.
The wind at 900-1600 ft, usually has a northery component so tightening the turn.
Cheers Mike,
glf