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I've tried to use the solid spacers in any number of different units. None were the right size and trying to get them right ended up just like it ended up for you. Now I only use the ones that include a shim pack to dial it in. I've found that .001" difference in the shim pack can make as much as 10 in.lb. difference in turning torque.

Available most rear end parts places. The Ratech # is 4102.

ETA...It's been a little while since I've done a 489, but I remember the Ratech pieces to be pretty heavy walled. Not going to crush the one's I've used in the past.

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My bad,,,I 'assumed' he was using shims and still having problems. If not using the shims, I can see that it could be hard to dial it in.