Responding to the initial question:
In my experience, a "sinker" board of 0.8 (L-volume to kg-weight) is much easier to start than 0.54. Being closer to the surface results in a more corky experience, however accelerating requires much less effort; less awkward balancing and less pumping. Minimizing struggle = longer sessions.
I started with a 0.54 sinker 2 years ago, and due to the lighter-winds in my area, I could only realistically ride this sinker 2-3 times a year. Now, with my 0.8 board, I ride it about 50% of the time. The difference is that I am closer to the surface and better able to gain the momentum that is necessary to launch. To be clear, I only use my 0.8 board when I have decent wind and power in my wing. I need about 15 kts for this board to be feasible and am able to launch in about 20 seconds. If wind is marginal, I ride a big-ol' SUP board.
After trying several methods for launching, the rodeo method has worked best for me. I'm posting this video to show you what works for me in the hope that it will help a few of you folks out there. Of course, we are all different people, have different skills, body types, and flexibilities. So, I am not suggesting that other methods won't work better for other people. Watch the video to see how I launch after a fall. I have included pointers on the technique I use in the description of the vide. Let me know what you think.
Board dimensions: 4'8 x 20 1/2 x 4" x 58L
Enjoy the learning journey!
- Stuart