Turbo, you're welcome. About nonconcentric boolits. If they are out the same at 180d ( I think smart people called that diametric opposition), they may still shoot. I've done this, and while it's not the desired state, the ones I tried shot well. Not sure if I premember, but I think Veral covered this in his book. Intentionally 'beagling' a mould will produce a similar situation and any beagled boolits I've ever shoot were actually quite good.
Back to the drop out. If I do use it, the coating may last several sessions, wherein I will clean the mould with brake parts cleaner, and then redo the drop out with a qtip. I have several moulds that really work well with this procedure. More over than not I have more problems releived by improving venting than anything else. Beagling improves venting. sundog