You can glue in shaped minicell in front of the seat to extend the support from the seat bottom. Others here have done it.
That said, when is the rolling class? That will tell you more about how that seat needs to be set, may be a better idea to wait if it isn't too far off.
Obviously waiting is not something you love to do, but before you spend money on messing with the seat...
Kayak Motor Kit
Cartop Kayak Carriers
Paddler's Truck Rack
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