Well part of your problem with the slow 60 ft. is the 4400 vert stall, with your current engine setup. You need a vert stall around 5000 to 5400 IMO for a more optimum setup with your current combo

But you stated your goal was to run 5.80,s or so with a 200 shot.
So were talking two different verts IMO The current vert is not optimum for your current combo, it may be for the 200 shot combo, or maybe not..

You may be in the market for two more different verts. To optimize the current setup, absolutely. The 200shot set up, not sure, but probably.