Fairly sure the forks were made by Showa too – air-oil if I recall – so might respond to the old-school approach of changing oil weights, depths etc for tuning
Yup, Showa made the Mogul line of forks for Trek, as well as the earlier DS-2 and DDS-3 forks (the black ones that weigh like 8 pounds.) I actually had an early DS-2, and the thing was nice on compression, felt like a couch. The downside was that the brace was a POS so even though the thing weighed a ton, it was a complete noodle. The fork also had an irritating trait in that it would 'pack' while riding, the rebound was way too weak, regardless of air pressure or dampening. You'd start a trail with a 2" travel fork, and end up 10 miles in with an 8lb flexy rigid fork instead. I had an opportunity to ride the Moguls when they came out, and the only thing I gathered that was any different was the color, performance was very smilar to the DS-2.
OK, I'm exagerating on the 8 lbs...call it 7!
On a queen, especially a 9000, you gotta have the Mogul on there, so I applaud you for keeping it. Neat little piece of mountain bike developmental history there, Pickle. Good Work!
Now If you really like weird and not at all functional, your next challenge should be a Crosstrac Sonoma with the little surgical tubing air pressure link between the two fork legs, and the weird Firestone air bladder rear suspension that looks like a plunger head. THAT would be even cooler! Might cost more though...
Drowning in Retro!