Jack L makes a good point about paddler vs. boat size. From the pictures, it looks to have a fairly low fore deck. If that's the case then you may have a pretty straight leg paddling position. If you have flexibility issues that can strain you back & a higher seat back actually may hurt rather than help.
In my case I have tight hamstrings and would start to have leg and back pain after 45 - 60 min. I paddle a Pygmy Arctic Tern 17' and used the standard outfitting (thermorest pad seat & fairly high plastic back). I switched last year to an I/R back band and a carved minicell seat. I've added the old pad under my thighs for support & am generally comfortable. I've also been stretching the hamstrings on a (nearly) daily basis. also doing some work on my hip flexors as well.
Full Size Sail Rig
Kayak & Canoe Outriggers
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