Generally I'm not a big fan of the 'Lead Sled' and other rests of that type that hold the gun for the shooter, mainly because they are 'targeted' (forgive the pun ) at shooters who are probably not going to go back and verify their zeroes from an actual position they might use in the field.

If your crosshairs are wobbling around a 1" circle @ 100yds, from a rest... assuming you don't just mean the normal respiratory movement, which can be coped with... is quite a lot. Are you gripping the rifle really firmly and/or pulling it back into your shoulder? That much movement almost sound indicative of muscle tremors from trying to hold *too* hard - which is really hard to do consistently, and most people start getting the wiggles like you describe.