I have tried a few types of harness lines. I too do not recommend the Wingman harness lines as they are heavy and get in the way.
My favourite by far is this:
winglines.com Monoline adjustable.
I reckon that single point attachment is the best for 'feeling' the wing, and it is light and simple. It doesn't slide once locked on the handle / boom and is easily adjustable on the fly.
