Mart -- good luck on a speedy recovery.
Regarding bracing technique, a low brace is much more protective of your shoulder than a high brace, but in either case the "engine" for the brace should not be "slapping" down and putting great force on the paddle and shoulders. Rather you should get some
purchase on the water and then rotate the ski back under you using your hips/core. For a high brace you want to keep your paddle low (below your chin), in the forward quadrant, if possible, with your elbows close to your body. Fully extending an arm away from your body, and slightly behind you, is called the "dislocation position"; it takes very little force to injure your shoulder in this weak position.
The above is how a brace is taught in sea/surf/whitewater kayaking, but I'm wondering if this is not stressed as much in surfski paddling since you don't have thigh-braces to permit contact with your legs? FWIW, I brace and use hipsnap the same way whether I'm in a kayak or a ski.
I'm wondering this because of the following quote from "SURSKI with the Pros...",
Using your paddle is the quickest way to stay upright; if you feel that you are going to tip over, slap the reverse side of your paddle blade down on the water on the side that you are leaning over. ... As you get more proficient, you can slap the water harder, applying more force to your brace, thereby providing more force to keep you upright
No mention is made of the hips/core in any of the information for bracing. I consider this dangerous advice and a recipe for injury. However, maybe I'm all wet... although I'm an experienced kayaker/instructor I'm a relative newcomer to surfskis. Thoughts?
Edit Correction: I did find a passage in the book that does provide some information on using the body (legs) to balance, it it precedes the section on bracing but is not mentioned in reference to bracing.
Greg Stamer