Your results are indeed typical. I'm a little surprised at the Hyperion, but not the Nagler. Using Al's field stop formula - the 2.5T6 with it's 3.4mm field stop, the eyepiece should have a useful A.F. of 77.92 degrees. This is typical of Naglers.

The Hyperion would require a field stop of 10.6mm - but with so many people playing ring games, an actual measurement may be problematic, and determined by the lenses themselves as there may not even be a field stop, as such.