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Well,
I teach high school autos and metals and I have had only one cope "lift" and it was due to very poor mold making by some kids. If you are worried you can stack some cinder blocks on top of the cope so it doesnt lift. I think the real problem with sand casting is strength. I believe that density is lacking and it would probably help to stack another mold on top to add head to your sprue and riser to increase density. I personally like the quality and density of LFC better than sand, and this can be attributed to the insulating property of the ceramic coating. If you have questions, just shoot.
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