BTW Wiz what I interpret from you posts is that your batteries are never fully charged by your solar so no apparent down side to maintaining the voltage.
But for reference your situation is not typical. ie For a discharged battery use bulk charging voltage and when the batteries reach the bulk end stage they start reducing amps while the controller maintains the bulk/absorb voltage. Then when the amps reach the float level the voltage is reduced.
So what I get from your posts is a very unique situation which should not necessarily be a guide for others.