I have several Dynastar Twisters and a Volkl Rebellion, both models are factory set at 1/2 (base/side). Elan Bloodlines are still at factory settings at 1/1 but I may play around with the side angle when this becomes my every day ski. I have a Hart bump ski still in wrappers, the factory settings claims .5/1.5-2.
As for my preferences, the 1 deg base lets the skis drift or slip into the face of the bump when the formation is random. The edges are set to a "normal" angle (1-2) so that it can still bite and lock into hard snow. The latter is also dependent on how one skis the bumps, if its more slip based then go for the 1 deg side if its more carve-centric go for for 2 deg side.
BTW, I do tune my own skis and like to keep the side bevels all the way up to the tip to the ski, the rationale is I want that tip to bite both in the flats and in the bumps.