Personally, I would argue against any magnetism on the orbs once thrown. I consider learning the mechanics of the calsses and getting better at doing them physically a big part of Orbus. I don’t really want a crutch put in for the orbs just because we haven’t become experts at them yet.
What I think would be a nice compromise would be if you hit an enemy dead on it does the full damage against just that one (or three nearby for lightning). If you miss, then either when it hits the ground or when a timer expires it could explode with probably the same aoe range as a musky orb. This could either be a single target damage/effects to the closest enemy, or hit everything in range for reduced damage/effects.
With this, a near miss can still be useful and even tactical in come cases and still help push the player to improve to get those perfect shots.