Have you tried 'entityfx 34' (vertexalpha + vertex color) - not sure if that would work with 'entityalpha' but if you use vertexcolors I'm sure alpha always screwed up?
I don't think entitorder will help as this apparently disables the z-buffer altogether for that entity.
I don't think entitorder will help as this apparently disables the z-buffer altogether for that entity.