something more than a Year ago, I was looking for a board too, luckly a friend of mine is a well expierienced wave kiter who I think has tried and stood on so many directional surfboards that he might have lost count himself
, but he told me , not to go too small in the beginning.
At that moment there was a Naish strapped surf 6"1 in a sale out, he adviced it, because of its easyness, and forgiveness this board has, and really I improved fast, and with its volume and size, you can use it most of the time, also in harder wind. I have 1.77m and 80kg
You can use the board, without pressure in your lines, just let your kite drift with you , as you are surfing even small waves.
The footstraps on it, I only use the front one, with my backfoot I just balance the board so it is not too deep in the water front or back... the backone is only used to make the cutback and in some onhore wind/waves
This said...I would again advice you not to go too small in the beginning, everone is paying "learn" money and may/will buy an additional smaller board afterwards.