My Osprey is probably my favorite solo ever, but not in strong wind. The boat is basically uncontrollable in strong quartering tailwinds even with sliding seat all the way back (it's OK if you go slow). DF15 looks similar to me with quite a bit of differential rocker and more volume so that's what makes me wonder how it would be in big wind. My Osprey's ideal load is 160-260; it's a perfect fit yet I get blown around. If my dog was much bigger the DF15 might be my ideal boat.
Regarding lay-ups and cracking I had a friend crack my Blackhawk Zephyr by honking on tie-down straps and the Blackhawk lay-ups are generally very strong. I think I could crack any boat with straps (especially a stiff boat); I would not blame the Hemlock lay-up. Swift's mainstream Kevlar Fusion lay-up may be somewhat susceptible to spider cracks...especially in the chines just above the core. I remember one post from a guy with hundreds of spider cracks on his heavily used Swift. I've never seen a post suggesting they are a real problem. Personally I like a gelcoat so I don't have to be careful at put-ins and takeouts and for normal (?) rock collisions; one time submerged rebar actually lifted my Osprey...not sure how a skincoat would have done. But if I was dropping hard onto rocks I'd probably want a more flexible lay-up. As Alan said I bet you could pick any lay-up you want; outfitters rent ultralights.
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