You didn't mention why the PO suggested a new prop? Both aluminum and SS props can be repaired and "tweaked". Not certain changing from a MR/pre alpha to a SEI would have an effect on prop selection, maybe? Prop selection is somewhat like choosing what tires on vehicles, it depends on the primary use. Some folks carry a second prop for skiing/watersports to get on plane quickly, another for top end, maybe an emergency spare. I doubt you would be unhappy with the L2 23p prop previously suggested