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When you use the rancho's every adjustment affects the extension and compression. So for the stiff setting on compression it is also stiff on the extension not allowing the car to lift in the back as easy and put weight on the back tires.
Sorry to Hijack, That is something I didn't know, I thought Compression damping (jounce) was fixed on the Rancho's.
Goes someway to explaining why my car does what it does. 
It might have been. Its been about 4 years since I have had the rancho's. When I had them off the car I would mess with the settings and extend and compress the shock to see how they acted for each setting.
Sounds feasable, when the rancho's numbers are low (softer),the car has a tendancy to "porpoise".
The car weight transfers to the rear, squats (more with the softer setting, tyres dig in, rear then seperates (so violently the body inertia pulls the tyre from the asphalt and we spin), the car drops down and repeats down track to a lesser degree.
The higher number controls the seperation and the squat it seems. (not in that order though  )
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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