not worried about the springs falling out...just wire them in place so under articulation they stay.
as for OME's they do not give 3" of lift...right? but, I guess if the Calmini's keep sagging severely...and the OME's don't...then it would be better to have 2 1/4" lift that don't sag verses....3" lift springs that only last a few months then go to sh!&