I don't know if our set up was exact or not, but i found that a f/c before the double or a lead out inviting the dog into your right side worked better, particularly for Xena, to get more drive to the tunnel.  I tried to do 2 f/c's after the aframe instead of a r/c with Xena but the 2nd one was late, may have still been faster though.  I don't think I could get there with Phoenix. 

Wendy