You can leave the solar "on" the whole time regardless of what the converter is doing.
I like the adjustable voltage PowerMax units Randy sells. Range dial from about 12 to 15.5v. That way you can set your own preferred voltage and invent your own charging profile as to when to change the voltage from absorption to float.
That beats the Charge Wizard method which only has the three voltages to choose from, and the highest is 14.4v. You do need to be able to get at the adjustment knob but that is/can be easy with a deck mount installation.
You mentioned fan noise. With the higher amp converter you might get the fan more than you are used to with the old converter that never worked hard.
I don't have info on how much noise each brand of converter makes. There will be some fan noise when any of their fans come on, can't be helped. Keep in a well-ventilated place to reduce heat build up and so fan running time.