I've had the hand tingling and numbness intermittently for over 5 years now. It happens mainly at night and I think it's related to sleeping on my side and blood flow impingement by way of the deltoid and upper arm. Sometimes it hits me in the car while gripping the steering wheel. The rack pull could have caused your finger problems from the grip. It sounds a little mysterious, but there is some nerve related stuff that happens in some of the jujitsu techniques we teach that target those fingers specifically when the wrist and elbow are twisted in cranked certain ways. Chin Na kung fu calls it seperating tendons, and I have no idea how that translates to western medicine other than that the techniques hurt like hell. You might try wrist stretches like they show here.
http://www.howtostretch.com/wriststretches.html
These are pretty close to what we do in warm ups at the dojo to prevent or alleviate problems.