That GW did not (or only in the last years) solved the wet transom problem in more than 30 years is very disappointing for such a top tier brand. I consider GW far superior in build and ride quality than BW, but the rather simple solvable transom problem is just frustrating and expensive to fix.
My 2011 306 Canyon is in the shipyard and fibreglass specialist should repair the swollen transom, but still waiting for a quote.
The problem with submerged lower units is rather common, particularly on pre 2005 hulls being designed for lighter two strokes but i see that even on newer and new boats. It is either a design flaw regarding center of gravity or the choice of a low transom with short splashwell as both limit how much the engine can be tilted up. On most dual outboards hulls a higher transom is not really a issue while on single or triple outboards it can be a issue as center engine length may be too short even on a 30" outboard.
In case of my 306 Canyon, i can't tilt my BF350 more up, tried to set the digital tilt limiter to zero but from what i understood there is no limit set. That steers me to believe that GW just miscalculated the COG and never fixed that, maybe the new design Canyon with the different console style does better.
Chris