Alignment drift?

Any ideas why the alignment keeps going out on my 66 Fastback? Namely the toe adjustment? Details: V8 car, manual steering, all new suspension parts, less than 15k miles, still check out tight and good condition. Maverick spindles and disk brakes. No nasty potholes or curb whacks by the driver.
1st alignment was probably not quite right and was wearing the inside edges if the tires. Too much toe out.
2nd try was better but seemed to still wear the tires.
3rd try at different shop was good.
Now, after replacing a P.O.S. made in Mexico wheel bearing, the tires squeal (scrub) and dart around when accelerating and the car lifts the nose. Taking measurements when lifting the car shows the toe changing drastically (1/2"). I tried to compensate a little with a small toe adjustment but now it's back to the 1st problem.

Did supporting the car at the jacking points cause alignment changes?

I'm not mistaking camber for toe. Yes camber angle will effect tire edge
wear, but toe will also. Excessive toe in can make the tires appear tilted
also. I'm comfortable with camber settings from the last alignment sheet
(don't have them at the moment). The toe setting last time was a big change
from negative to positive, which would account for tire wear on the inside
edges. But it was at a positive setting the time before. Which is why I'm
wondering what is changing. At first I chalked up the changes to the new
components settling as well as the unibody after being on jacks and without
a drivetrain for an extended period. I figure by now that should be settled
in. I did have to replace the strut rod bushings in short order when it was
put on the road. Crap rubber I guess, they're urethane now. I'm wondering
if the part quality is lacking somewhere else now.

The tie rod adjuster idea is a good thought but I cant see this thing
vibrating loose. I'll check into some better ones though. The driver side
has very little adjustment left compared to the other side, which is
curious. As for the bump steer from different geometry in the Maverick
spindles, I'm all ears. That makes some sense, though I hadn't heard
anything about it in my research for making the swap. Did I make a bad call
using those parts? The car does want to wander when it hits bumps on long
sweeping corners. I've attributed that to poor alignments up to this point.
The steering angle changes when the suspension cycles look pretty drastic
though.

I didn't drive it before it was torn down so I don't have any reference to
the stock handling characteristics. I'm not the primary driver either so I
only get reports from the wife and my occasional run around. She had no
idea the growl from that wheel bearing was a bad thing.