I deal with this every year because i live in snow country and the lakes are frozen 4 months of the year. In the spring when the ice goes out I am in peak fitness from nordic ski racing all winter. But sitting in a ski feels horrible, my technique feels hopeless, and I have no power. I have learned over the years not to fight the spring suck. Going hard in early season just brings sore muscles and discouraging speeds on the GPS. I just go for easy paddles, and focus on trying to gently find a good feeling stroke. I often turn the GPS off so i focus on feel not effort. it takes me 6 weeks of un-fun paddling, and then something changes and it feels good again and I have power. I imagine it is the same as when starting a weight lifting program. It takes about 6 weeks to get the first returns on your training. So my advice is to go easy and be patient. Your form and power will come back, but forcing it wont get you there any faster and might get you injured.
Current Skis: Nelo Vanquish AIR, Epic V10g4, NK 670 double, NK exrcize, Carbonology Feather, Think Jet, Knysna Sonic X
Former Skis: Epic v10g3, Kai Waa Vega, Epic V12 g2, Epic V12 g1, Epic v10 double, Nelo 550 g2, Fenn Elite S, Custom Kayaks Synergy