Single backstrap helps minimise the lever and thus damage, make sure your foil has jumping covered in warranty, most brand foils wont survive more than a few jumps, especially if you like me exceed 90kg/200pounds. Landing more on your back and waterstarting is better for your gear, landing flat on a wing pretty much guarantees to break it or your fuselage or bend your mast if its alu.
In terms of kit, go as small as you can on the wings, speed is your friend, not lift, also small wings have less lever on the fuselage so are less likely to break. I run my straps and mastbase all the way back, front screw in front, back screw behind the foil mast for single backstrap, and mastrack on 80cm from the front tuttle screw for maximum pop. I know Balz M?ller runs similar settings for his mastfoot, his backstrap is further forward, but his frontstrap is further back and his front wing is slightly further forward than mine. The end result should be that the back strap is not really comfortable to sail in, unless you want to leave the water entirely ;).
Then, for the jump itself: go downwind, heaps of speed is your friend, I mostly enter jumps at 45-50 kph. And, as LeeD says, for the pop, go down and then up, fast, its the sudden shift which makes the dream work. Also, make sure you're powered up!! When doing those things right I often go as high as my board 3-4m above the water (easy mast high when going for the backloop), and that is on totally flat water.
Tried to upload a picture but its tilting it 90 degrees for some reason....
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