Chuck,
The Equinox is a great machine. However, as detectors are made lighter and lighter, the heaviest component ends up being the coil. When the coil is the heaviest component, what ends up happening is that you have that weight (coil) out at the end of a long lever, and with nothing on the other end of the shaft to "balance" it (think of a balance scale -- the kind with the "plates" hanging from the chains, on either side of a fulcrum), you end up imbalanced, and your wrist/arm/shoulder ends up having to "do the work," fighting gravity to keep the coil floating just above the ground.
Look at the CTX 3030 -- a more balanced machine. What do you have? A large BATTERY out at the butt-end of the shaft. Think about White's machines...you have the whole CONTROL BOX back there at the butt end. On the Equinox however, and several other machines, batteries have gotten smaller, control boxes have gotten lighter, and the push recently has been to make machines "as light as possible." However, light -- but imbalanced -- is not necessary ergonomically comfortable. This is mainly apparent when swinging a machine with the very large coils. So, a counterweight can help. While it makes the overall machine weight a bit heavier, it nonetheless makes the machine FEEL lighter -- because if you have counterweighting, you are not doing all the work to keep the coil levitating above the ground as you swing -- the counterweighting is HELPING you, with your hand acting as the fulcrum point.
This is not unique to the Equinox. The AT series from Garrett are very nose-heavy as well.
It's not that the Equinox is an issue, per se. MANY machines are difficult to swing for long periods of time. That's why swing harnesses were developed -- same thing...trying to take some weight off the "coil end" of the rod. So this is NOT an "Equinox only" type of thing. MANY machines, with large coils attached, become nose heavy.
The Equinox is an excellent machine. Give it some time, and your finds bag will confirm that...
Steve