cyclone speed,
3mv is a pretty conservative peak setting, you might bumpo that up a little at a time and you'll get more into the packs. Probably not 500mah more tho...
When we were charging and looking for runtime over voltage, we'd cut back on the charge rate. Maybe going down to 4.5 ampos or so would get more in the pack.
You might also experiment with the multi-step "ctx charge" option instead of a straight constant charge. Step charging was supposed to get more runtime from a pack. I did play with step charging around six years ago, and I did seem to get a little more runtime on a charge.