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teatrea said..
so did the larger heavier board help?
No, for foiling, larger and heavier has no advantage. Once you foil on a shorter board, it is hard to get back on a longer board, everything seems so slow, and it is harder to pilot due to the added latency in the reactions of the gear.
I guess the guy you saw was on a slower wing with extra lift (bigger area or more importantly, profile thickness). A small board should fly faster as you are able to better control the foil and tap the juice.
I don't think I would want aerodynamic lift in a board. When you begin to get speed on a foil, you really want to have everything be as neutral handling as possible, and if possible auto-stabilizing.