Discovered something bad and got a few other things done.
1. Flushed out another 2 liters of AHC fluid. 1 from the height control accumulator (~270mL at a time) and another 1 liter from a mix of all 5 bleed points. 5 liters total now. I plan to do another 3 liters or so once my shipment from McGeorge arrives with more fluid (only $17 each!) and new bleeders and caps. The fluid is better, but still not totally fresh. AHC flushes are sort of tough because so much of the fluid seems to mix when you cycle heights. Unlike brake bleeds where the fluid is relatively static in the system aside from your bleed strokes.
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2. I installed 30mm rear Spring Spacers from Slee. AHC pressures in the rear went from 7 down to 5.7, but I also removed a drawer from the SS1 and the ARB fridge. Spec is 5.6-6.7 so I'm in great shape. I'll add back a new ARB hydraulic Jack and the Dissent door on the second swing arm so some of that weight change will be undone.
Front pressures are down to 6.2 or so. I can undo a turn or two on the torsion bars and be in good shape up front.
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3. Also changed out the larger diameter power steering reservoir hose.
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4. Discovered my rear pass axle seal is leaking. Oil residue on the backside of the brake shield. Looks like that's a big job that requires a press. I just sold my 12 ton, but looks like I'll be buying a new 20 ton (with pnuematic assist I hope) sooner than I thought.