21700 45a

Hello community real short I have a jkbms and I'm using the 21700 45a cells to get 72v but pack won't fully charge only gets to 79v why could someone tell me how if they have same setup. Oh pack is 20s 4p controller is 60a in the ap it only allows me to set SOC to 4.18v not 4.2? HELP.
 
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