First you need to know what the charge rate is for the packs. Its normally listed on the spec sheet in a C rating. say the 3800 has a 2c charge rate.

3800mAh = 3.8 amps
3.8Ax2c=7.6 amps max charge rate.

Im not familiar with your charger so I cant tell you how it reacts.

As for breaking them in most manufacturers recommend fully charging and balancing then half discharge for the first 5 cycles.