Stiffwrists -- I appreciate the additional kind words!
I know what you are saying; when I first attached a proper amount of counterweighting, it DID feel very different -- the coil sort of "floats," instead of resting on the ground. That's a good thing, in terms of removing the pain/fatigue you would otherwise feel, but if you were using the coil "resting on the ground" to help guide you in terms of keeping the coil "flat/parallel to the ground," when you are sweeping, then I could see you needing to make an adjustment, so as to keep your eyes on the coil a bit more, to confirm that you are swinging it flat/level. The good news is, though, that you definitely experienced an improvement, in terms of fatigue. That's the goal!
One thing I will say, is there is a GREAT lesson there, buried in what you are saying...about keeping the coil FLAT/PARALLEL TO THE GROUND, when detecting. I can't tell you how many people -- mainly newer detectorists -- I see swinging their detector like a "pendulum;" the only time their coil is within a couple inches of the ground is right at the "bottom" of their swing, out in front of their feet. The rest of the time, the coil is so far off the ground there's no WAY they'd detect a target! Keeping it flat -- i.e. "low" as some people call it, is SO important...through your ENTIRE sweep...
Steve