I had using those cells wthout any problems.
just follow steps below;
1.When new,charge those cell at 5A for 500 second,then put on discharge tray till the light go off.The cells is good to use for race.
2.When charge,use voltage cutt off of 3mv/cell(or temp.45 degree)at 6 amp.
3.Discharge your cells at 30 amp.cut off 0.9v then put on discharge tray till light off.
4.Storage,less than a week,just discharge 30 amp 0.9v cut off,your cells will be ok.More the a week,after discharge at 30 amp.put 500 second of charge in,then store.
Hope this help
Team Losi Malaysia