Billiefly;
Yep, I'd guess those wingtip fences postpone stall quite well... good trick. Thanks for sharing that idea with photos. You posted that a few months ago, right?
I may have to try those- when I pack up to go, those could be in the way, maybe I'll use some of those little rare earth magnets.

Coupling the rudder to the ailerons is a big plus as well, so that you still have roll control when approaching stall at low speeds.
I've always heard that the last effective control as you enter a stall is the rudder. I always forget that in the thrill of the moment! Splat.
I am flying in a relatively windy area, with lots of cross-gusting due to patches of trees. I am often using the rudder with counter aileron just to land straight due to strong crosswinds.
Do you find the rudder coupling a problem in cross-wind landings?