A straightforward attempt to relocate the HEPAX to page 9 succeeded. My configuration is now:
Page Contents
7 HP-IL
8 CCD-OSX
9 HEPAX-1D
A HEPAX RAM
B HEPAX RAM
C HEPAX RAM
D HEPAX RAM
E Sandbox (L)
F Sandbox (U)
I hand relocated the RAM from 8-B to A-D. This entailed changing the previous and next pointers at $XFE7 and $XFE8 to point to the new values. HEPDIR reports "H:DIR EMPTY" and HEPROOM gives 2,610.
Regards.
Howard