There was some loctite on them but I was able to break them loose, after mild heating with a propane torch, and with a short extension on the wrench handle. Did you have the set screws backed out? I was careful heating so that I didn't get them hot enough to damage the bearings. However, these bearings are not as critical as bearings on a high speed rotating shaft. I inspected the bearings before re-assembly.
I worked from the back with the wheel off of course and the bike jacked up. Everything had been removed from the swing arm including the shock before I started removing the pivot bolts.
I'm surprised that the "S" has 17" wheels, as you say. I thought it had 16" both front and rear. The specks I have read in the past have listed 16" for the "S". Maybe they changed, but it is strange that they wouldn't change the DS if they did change the S. If the S has a 17" rear wheel then it means that is also has a different swing arm than the DS, because the DS swing arm can't fit a 17" without cutting away some of the cross brace tube, which is what I did. Possibly, a 17" would fit with a really low profile road tire. I notice that my 2012 DS has a flat on that side of the cross brace tube that my 2010 does not have. Maybe that flat allowed a 17" rim with a low profile street tire to fit on the S where a high, 17" knobbie, tire wouldn't fit on a DS without the mod that I did.