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Regarding the davits, I have had the same questions. First to stop the side to side movement of the dinghy the only solution I know is to firmly tie the dinghy to the stern of the boat, side to side to hold it in place. If you have davits that rotate then also fix the davits firmly in place. I added two cross bars between my two davits to keep them stable and add some strength.
I have a very short harness to hold my dinghy so can raise it very high. It is about 0.5 M below the pulley on the davit which I think is high enough for day sails
and coastal cruising. Like you, I will bring the dinghy on deck
for off shore.