Watts, can you float easily? I think 2kg would do ok, that about 4.5lbs right? I'll try a 5 lb weight and go from there. I hope to hear you getting your >75m dynamic. Do weights really help that much? When I first heard of it I thought it would be counter-productive, having to drag more weight along.. O well, if it works it works.
Ike
Ike