Been shooting a lot lately and have been noticing some problems with my arrow flight. I was shooting out to 30 yrds. the other day and noticed a dramatic arrow angle upon impact. I'm a lefty and the vanes were pointing pretty well right (see picture).

I've been reading up on the subject and some possible explanations. It seems like it might be a weak arrow spin. Too heavy of a draw weight or too heavy of a arrow/point. Is this the correct assumption?

I'm shooting a single cam, 29" draw @ 70#, Beaman ICS 400 grn. arrow with 100 grn. heads.

If anyone might be able to share some information I'd appreciate it. Thanks for the help!