Without seeing it, I would say the small spacers mount under the bracket that holds both the throttle and TV cables. Unbolt this bracket from the manifold and reinstall with the spacers between the bracket and manifold to lift the position of both cables. After you installed the spacer you changed the relative position between your TV cable mounting point and the TB unit, hence the increased harshness in shifts.
To get the tranny cable loose: press the TV adjusting button (just behind the cable mounting bracket) on the side to relieve pressure, disconnect the cable from the TB (pull it foward and then away), squeeze the two tangs on either side of the cable (holding it in place, just in front of the cable mounting bracket), then push the cable back toward the firewall.
Now, I'm sure that's about as clear as mud, have fun.