I'm going to sort out the footrests first and worry about something I can correct with more paddle power later + they want £179 for a small rudder
Supply was a real issue when I got mine, with some places only being told what they would receive (in respect of Perception that is)
I would highly recommend going with your first idea (correcting with technique and power) rather than fit a rudder. Ultimately, that would make you a more efficient paddler.
EDIT: Just saw your paddle, how long is it? Optical illusion perhaps but, doesn't look big for a sit on top paddle.