I had two of these kites a 14 m and a 17 m . To be honest they have a stack of grunt but up against a newer high aspect kite such as your edge , they have very limited upwind ability as they sit way further back in the window .
I doubt you will get any benefit over your 13 m edge.once you get the apparent wind up on the edge it would absolutely smoke the contra, also because of the pulley bars on these things the bar pressure is insane
, I would never go back to one especially for a race board.different story for mowing the lawn on a twin tip.