Would a 27 owner please say if that glider weight/cg envelope also
shows a variable aft limit.

There is no weight dependant envelope of cg for the ASW27

Section 2.7 state the foremost limit is 0.210 m and the aftmost limit is
0.320 m.

In the non-approved part of the Performance section, point 5.3.2.3 there is
a discussion of the optimal cg position.

Øyvind Moe