I use my Novak Millenium Pro to charge them and recently tried taking the pack off charge when it reach 9.1V (it usually completes a pack at about 9.25V).
By taking them off early the packs were only fairly warm, not hot.
This did seem to help keep the internal resistance down as my car had loads of punch.
I have also managed to let my batteries discharge too far using car bulbs etc then walking away on more than one occasion, yet they still seem fine (once, I checked the pack voltage with a DMM as soon as i'd ripped the bulbs off the pack, it read 3.4V for the pack and as this point the voltage was still 'recovering' rapidly).
Before use, usually the day before, I discharge whatever was left from the race day (racing Stock the packs still have half their charge left after a run) using a Spintec Battery Manager, I take the pack off when it's down to 6.7V then finish the pack off on the Novak Smart Tray.
I use the Smart Tray again just before I want to charge for the race.
Repeat....
Skiddins