The setting of 12 pounds, which would correspond to 16 lbs of resin per cubic ft of resin, the white dot could have been set a bit under 9. However that would be less salt-efficient than the 6 lb (8 lb/cuft) setting.The Brine Cam setting is the salt setting you had already identified is 12 lbs currently but is to be reduced to 6 lbs along with resetting the proper capacity between regen cycles.
If your resin comes up to the "Full" mark, that looks right. See https://terrylove.com/forums/index.php?threads/gravel-bed-question.31555/ #6 for a discussion of that. If there is no gravel, adding 8 to 12 pounds of the right gravel to fill the bottom dome would be an improvement. Gravel sinks, so there is no need to remove the resin while adding gravel.
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