Personally I favor the Stud Boys Shaper bar! The carbide hold in ice, hourglass shaped host bar hold in hard snow and the keel of the ski works the rest. In terms of anti dart? You can shim just about any set up to be anti dart. Down force needs to be on the correct part of the ski to allow the keel to cut it's track and not chase it's track! One of the primary reasons many people see such good results in handling with the Bergstroms is that they offer shims and excellent instructions on how to do the set up!
My suggestion is to throw on some Shaper Bars and shim your ski to so the weight bias is just behind center on the spindle and toe your tips out 1/8".