Im in the same spot. The OME spacers hold up well. I think the cornfed spacers are aluminum, right? I don't see an issue. I know that stev, Sonoran steel, talks about this same topic.
I'll probably go to a taller spring. There is rumor that ToyTec is working on a 4" tall, 220# coil.
The LC coils will give more lift and flex great but don't handle as much weight.
If I was going to use a bigger spacer I would remove the OME one.