I took the Recon out for another spin yesterday and took an allen key along with me. I spent the day lapping the Tees Barrage International Whitewater Course and making fine adjustments to the seat position each time.
As a result I have settled on seat position of 1.5cm short of fully forward. This seems to really help drive the boat.
I have also added padding to the area where my knees make contact with the hull for an extra level of comfort. It works really well.