Let me see if I can clear this tail wagging up.
If your seeing massive tail kick then your shaft is either still weak or has already gone stiff.
When I have a shaft with minor tail kick I usually stop and start comparing it to a fletched arrow.
I think most of the tail kick comes from having so much weight on front that it causes the shaft to flex way beyond the norm. Too weak of a shaft will flex way more than one with light point weight. If the shaft has gone stiff you will most likely see slight tail right then a jump to the left rather and a suttle drift.
Hopefully I’ve put this in a way that everyone can understand. If not all i can say is: