Wow....Allot of stuff going on here...Since we have an Iaido practice that was developed specifically for Aikido (After all Aikido is the Sword.
) I would suggest that you might want to feel where there is tension in your cut..If it's coming at the end and the tip is moving then there maybe too much tension in your forearms which is affecting your "follow through". Folks that are right handed have a tendency to "jerk" the tip until they learn to relax. My 2 cents and now you guys can go back to digit gnashing over Sword Practice in Aikido.
William Hazen