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KDog said..
. After windsurfing forever it's hard to not want to use them.
Tight vs. loose. We've got examples of both here. Panducah with an "only the toes in" example and the Door's looser than a tennis ball! What's safest? One option is statistically safer the other, (what are the chances of the stats being identical?) but one person's experience is not statistically significant. Many have sailed for decades on the less safe option without injury and others have come to grief in a short time using the safest option.
Maybe as Kdog says it's your windsurfing background that is hard to break. Ex Wavesailors go for loose straps and ex slalom sailors tight.
LeeD has suggested recently that it's the intermediate setting that's most dangerous. That makes sense if you think about the mechanics of rotating out of them in an over the handlebar crash. If your footstraps lockup on a 60 cm waveboard with a 9 inch fin going over the bars, chances are the board will follow you.