My normal use is to charge at a very high rate (whatever the max of the charger is) , and unfortunately is a big variable. For testing I've found the biggest variable is cell balance, % of charge and temp. I try hard to make real sure the cells are all full and warmed up.

Nice thing is we were both using 10 amps as a standard. No more 10 amp limit for me since I have the cc-400 load , hopefully I won't need the second one real soon.