Calb 180 AH batteries

Hi All, I have 15 CALB 180 AH batteries, configured for 48v nominal setting. I would like to know some different opinions on the optimal level of discharge before recharging. I have a Link-10 gauge that shows volts, amps, and amphrs used. I have usually been recharging at about 110 amphrs used with the average being 104 (highest 123, lowest 65)

I would appreciate some thoughts.