special_k10101Haven't skied the M5 but I might be able to at least give you some data points.
I have a pair of 188 regular stiffness D'Riddums, I'm almost exactly your size, and I've skied them in WA, Tahoe, and Hokkaido.
The D'Riddums have the same listed turning radius and weight (don't know how that's possible), which I've found to be totally reasonable for even the tightest trees. Since they're five-point, the swing weight is impressively low and I have no problem spinning them or getting them sideways. They carve super tight and surprisingly well on hardpack but I love that it's still easy to kick the tail out. I'd say the regular stiffness falls into the medium category with tons of snap and enough stability to mash through heavy crud, so I would imagine that the athlete stiffness on the M5 will be more than enough for you.
This season, I've skied these more than both my other pairs of skis combined, and I wouldn't hesitate to use them in any conditions outside of the park, so you might consider grabbing the D'Riddum instead. Lengthwise, they've been more than enough for me hitting medium-sized cliffs and skiing some heavy, variable snow. I think 188 is a good compromise in terms of stability and maneuverability/playfulness.
Don't know if you've skied any other Fat-ypus skis but aside from some minor topsheet chipping, they've been pretty burly, surviving some pretty big rock impacts, so I've been super impressed with the build quality.
Feel free to post or PM if you have any questions. Hope that helps.
Thanks for the very informative reply! Since i am not looking for great groomer performance (strictly off piste), could i use the D'Riddum as a daily driver? Also, do you get any tip deflection at high speeds in crud?