I run a VTAC 2 point with the sling over my strong side. It took a bit to get used to but I like it better than a one point.
Here is a video of how I run it
Viking Tactics Sling - Instructional Video - YouTube
As for my pistol I usually run it in a belt mounted holster on my strong side, and for the times I don't it's on my chest at a 45 degree angle. Now personally I see no advantage to "cavalry draw" from the weak side, it just seems pointless to me. As for cross drawing from the back you get added concealment but in any combative situation I wouldn't use it.