Thank you. I have mostly used Efke 25 in 120 and shot them under different lighting conditions and sometimes using different filters, so I have just compensated for the filter factor from memory, taking the lower red sensitivity into account. I have a few rolls in 120 and 135 left in the freezer, and some sheet film in 9x12 and 6,5x9 that I'm saving for special occasions.
With 8x10 you could cover a wall with a print and still don't see the grain.
Have you tried Adox CHS 100 II, and what do you think of it? It's also orthopanchromatic, but is more forgiving than Efke 25 & 50, and the grain is more like Efke 50 than the old Efke 100.