My advice is to learn the Tahitian canoe paddling technique. All of us naturally use the Hawaiian technique, but training to use the Tahitian technique will bring variety your repertoire, and is especially useful for Short SUPs, as it greatly reduce the row because the shaft stays in a vertical plane. With some practice you can even easily generates counter-row (turning right by paddling on the right).
Google the tutorials:
www.google.fr/search?q=tahitian+hawaian+paddling+techniquI first read about it on Dave Kalama blog, THE must read for paddling techniques:
www.davidkalama.com/paddle-techniques-recover/And the best tips, are in
www.ocpaddler.com/forum/2009/how_paddle_fast- dig the paddle deep without a splash
- think of the paddle stuck in the sand and hauling the hips frontwards, rather than pulling the paddle back like "flapping a wing"
- all the power comes from the first foot of travel (on sub 7' boards however, I lengthen the stroke to exert a constant pressure for a long stroke, ~ 3'), steering the board along the stroke, with quick recovery, as the board do not carry speed between strokes)
One of the best technique I have seen is the stroke of Olivia Piana: quick and compact: