Got my Ex back from the shop, and on the drive home noted that it is a bit better, but still wanders too much. Not as much 'rolling pig' behavior on turns though.
Next stop is to check/adjust/replace the steering box, new shocks, and sway bar, along with alignment/tie rods/ball joints check/adjust.
Am going to reserve judgement on the spring swap until I sort out all other aspects of the suspension.
Was hoping for a WOW factor - drat!
At least by the end (of my wallet) I'll have a tight Ex-Box!