Finally think I solved my vibration issue

I've been dealing with a bad vibration for as long as I can remember. Tonight I was reading a thread about balancers and came across a picture of a 727 flexplate and a 904. I remember a post on here about how the dot was suppose to line up with the weight on the converter. I went out and looked at mine Friday and it didn't have the dot. Well I went through my parts bin and found one with the dot. I went back inside and noticed the difference in flexplates wasn't just the dot but the 904 has triangles and the 727 has circles. Needles to say 12 years ago (I was 18) I paid a shop to swap my 904 for a 727 and they somehow reused the 904 flex plate.

Any ideas on what kind of damage this may have caused? (Things to look for)