Ahh weightlifting, we have quite a few members on our Thoracic outlet syndrome (TOS) forum that were weightlifters..

Perhaps the spine isn't the only cause of the pinky/ring finger pain/numbness; a hint of weakness.?

TOS often affects the ring /pinky finger , sometimes the elbows and up the arm to the neck and upper back, eventually it all can join together if not treated early on.

I'll tell you now that many MDs are not fully up on TOS or TOS like conditions.

I got the best help from expert PTs & very good chiropractor..

Soft tissue, trigger points, posture are all involved quite often.
Our TOS forum - be sure to explore the useful sticky threads there.
http://neurotalk.psychcentral.com/forum24.html