This seems to be the problem for a lot caster and from what I've heard from a lot of players, the server messes around with your positioning when you're casting. If weight of the lands is casted under you while you're casting all you have to do is move out of it and try to cast something whilst out of the circle, the cast doesn't have to be successful, you just have to cast something so the server "supposedly" re-register your new positioning.

Personally, as a bard I've never had a problem dodging weights, I've even dodged it by standing at border and even in-between 3 weights.