Death wobble in this context seems to do with steering angles more than anything else.
Keep the drag link, etc parallel and you'll be good, hence the high steer, no?
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You would be correct if he had a linked suspension. with linked geometry, the axle is centered by a panhard bar that runs parallel to the drag link. if it is not parallel, the panhard operates on a different radius, and the draglink absorbs the axles side to side movement, causing bumpsteer.
On a leaf sprung rig there's really nothing to parallel the draglink to. his axle is centered by his leaf springs. His suspension is traveling up and down, not diagonally like a link suspension. being that he used a relatively low spring, there shouldn't be any side to side movement requiring a panhard bar. Although superdutys used them in the early days, I believe it was a preventative measure more than anything else. IE. they drove fine without them.
most often than not, deathwobble on a leaf sprung rig is due to too much or too little toe angle. even if the caster is way off, it can be made to drive straight down the road by compensating in the toe angle. If the toe is set to spec, but the caster is way off, the toe is off as well.
The OP used the OEM ford leaf springs. My hunch is the front and rear spring hanger elevations came out a little different than when under the donor truck.that would place the OE axle caster off, throwing the oem toe angle specs out the window.
