In order to properly wipe the stats, as Stu said, place the
currentwidget widget on your homescreen and start charging your battery. When the phone reports it's fully charged, unless currentwidget shows 0 mAh, it's not full and is still charging. Only when it displays 0 mAh has it stopped accepting charge and is actually at full capacity. Once in that state, wipe your battery stats in Clockwork (it's in the advanced submenu).
The full charging thing just means that 1/some of the cells are fully charged and not all. As far as I'm aware, as soon as the phone sees any of the cells at full capacity, it'll claim the battery is fully charged.