I have had the car for over 12 years, spun it well over 6000rpm lots and never felt an unbalanced feeling ever. I am told if it isn't correct, you will know!

yep and with what CAB posted and since you had it apart to change the real seal you would of noticed a ugly rear main bearing if it were a problem.

I also noticed and posted in the pic, the second thin throw which is also used for balance drilling looks uneven, like filled and its not uncommon to add weight and then remove here or there.

Ir run it and not look back, good luck with your new trans.