The side edges are machine beveld with a ceramic disc grinder.
I also have a pair of SX11. I did use my sidewall planer on them even though there isn't a sidewall. I trimmmed back some of the AEROSPEED material. Just do it gingerly.
I also start my side edge beveling with what is called "back filing". I start with 2-3 degrees more edge bevel and a short (3-4") Cross (Panzer) file. I make 2 passes like this. Then go to 1 degree past my finished edge angle with the same file until sharp. This will definetly remove an material in the way of attaining your final edge angle. I also use shortest files no more than 3-4" or the shortest available for a given coarseness. Because of the exttreme side cut in some skis a short file will keep you from getting a leddering effect on your side edge due to the curve of the sidecut.
Then I switch to a sharp fine file at my final bevel angle. I normally do a sequence like this, sectioning the ski into larger and larger sections, 4 overlapping passes, 3 overlapping passes 2 overlapping passes and the 2 full length passes. I then remove any hanging burr off the side edge by placing a arkansas stone flat against the base with about 1/3 the stone sticking up above the side edge using my thumb as a guide on the top edge of the ski. (Of course your ski is sitting edge up base away from you in your vises)With medium pressure and making sure the file is in contact with the base edge(you can hear it)you run he stone down the base edge & remove any "curl" or "hanging burr created by sharpening your side edge. Then use an arkansas or ceramic polishing stone to really polish the side edge. Any time I am using stones or diamond files I use SVST's secret sauce on the tool. I only go through this procedure on brand new skis that I want to change the side edge bevel on or anytime I have my bases ground flat.
Here is the article I got all this info from.
By the way this procedure works great.
I changed my new Stockli WC Slaloms from the factory tune to a .5 base & 3 side edge using this procedure & it worked great.http://www.holmenkol.us/myadmin/data...our%20Skis.pdf