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Up to you what you do in your workshop Ed, but I am with Howard on this - you should not use copper-slip, it's too thick and will have a negative impact on the bottom bracket function/lifespan.
Actually it's fine to use either anti seize or glue in BB30 (especially since the glue is also thick), Cannondale told us that we should use either, it shouldn't impact the bearing lifespan unless install incorrectky.
In a perfect world, it should be 100% perfect but it isn't and tolerance are never perfect.
Specialized also told us the same thing with their BB30.
edscoble
Up to you what you do in your workshop Ed, but I am with Howard on this - you should not use copper-slip, it's too thick and will have a negative impact on the bottom bracket function/lifespan.
I usually mount the bearings dry, having cleaned the entire area with acetone/brake cleaner, but have had similar (good) results using a thin film of good quality teflon grease in the shell.
I'd likely fit the bearings dry if doing this tomorrow, that said.