Vanes, fins... whatever you call them, it's all mold flash. This is caused by the mold faces not closing tight together.
But, there is the "fins" caused by too much pressure (lead forced out into vent lines), too much Tin, too hot. But they are usually not a problem, other than annoying...they can just be ignored and pressure (do not hold sprue hole tight against bottom pour spout), heat, technique adjusted to eliminate them.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)