Take a look at the illustration below. There's a nut and bolt in a slot that controls the position of #33 in relation to the shift lever. See if that doesn't make a difference for you.
Let me know and we'll continue...
Yes. If you look at the linkage where it hooks to the shaft that goes into the transmission, the shaft slides in and out in three detent positions - forward, neutral, and reverse. Put it in neutral, then loosen the nut and adjust the sliding portion until the shift lever you move falls into the neutral slot properly. that should give you the proper positioning for all three.
Let me know. If this adjustment isn't the fix we'll look for internal problems next.