DamonHD;
If those are NiMHs then them dropping to 2.4 or close isn't that bad and most all of my NiCD/NiMH sag under load . They could actually drop to 2.0 and still recover nicely.
I've recovered NiMH that sat at 0.98 with so far no ill effects showing up.
Are they being charged based on a batt level scenario ?
Cheers
Bruce S