Hi k. lauman,
I repair many fins for myself and a few others. The trailing edge is often not too hard to repair.
If the chip in trailing edge is big I use epoxy with glas 100-200gr/m2. Just cut a few glass layers that fit in the chip. And 1-2 layers on both sides for strong connection of the repairl. I press 2 flat plastic part with good pressure against both flat sides of the trailling edge, wait a few days. Sand the trailing edge flat with some sanding block. And you will have full performance back!
Make sure the trailing edge is pointing downwards during curing epoxy (you don't want the epoxy going over the profile).
Hope this helps a little bit.
The iSonic works quite good in rough conditions, just remember there has to be good power to make the ride stabilize. If you just want to go fast without pushing hard GO for futura!!!!! (these have also double concave).
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2011 Starboard iSonic woodcarbon 107, iSonic speed special W54, iSonic speed special W44
Severne Reflex Sails