The CG on the plan looks about right. You should only need about 20 degrees each way of up and down on the elevator. Too much elevator throw can stall the tail with the result that loops get bigger with more control (did some experiments on this).

The advice to move the leadouts back is wrong. Having leadouts too far back results in a loss of line tension up high. If they are where the plans show they should not be your problem unless your CG is too far forward.