6A for the charge rate, you don't need a super large delta on them (say 06). Linear mode, don't use the step charge or lockout options, K.I.S.S.
Important thing to do is to keep an eye on the cell temperature, if the cells are getting over 45 degrees C (hand warm) with any regularity then they will start to suffer, if the temperature is high either decrease the delta a little or decrease the charge rate.
Don't use any forced cooling ie high power fans and heatsinks, by doing that you make the outside cool but the inside stays really hot. Just a shaded area with a natural amount of air passing over is enough cooling.
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