I resealed mine, but didn't fully disassemble so I can relate to the "how can I can make it like new" desire.

But some wear and slop is inevitable and you might be going too far with the 6 Ncm friction setting. What are you going to do when the worm gear and the piston don't meet the tolerance? I checked the FSM and it says they're matched at the factory for the best fit.

Maybe try tightening that if the tools aren't too pricey, but it may be a wild goose chase. I'd consider putting new bearings in (either 6 mm or 7 mm, if I recall) and that may tighten the steering a bit - quality steel, of course.

How's the wear on the Pitman shaft?