Well, that took care of the problem!

I replaced the shafts on both sides with shafts from a different
manufacture. The first parts were manufactured by CV Unlimited, and
the second parts are by EMPI.

When the shafts from the two manufacturers are placed side by side,
the pulser ring on the EMPI unit is about 1/4" closer to the spindle
on the outboard CV joint. The new part lines up perfectly with the ABS
sensor, and the braking problem is completely gone.

Since I had everything apart again, anyway, I used the opportunity to
change the ball joints on both sides. Boy, does that really tighten up
the suspension nicely! I hadn't realized how sloppy things had gotten.

Just to ventilate here a little bit, I find it hard to believe that a
manufacturer can specify a part for an application that is so far out
of spec and completely unserviceable. The installation of those axles
by CV Unlimited the first time around created a potentially dangerous
braking situation, due to the mismatch with the ABS sensor and the
repeated activation of the ABS system. I have an RMA from the online
store, so they've authorized the return. If something happens that I
don't get a refund, I'll let you know. As it is, I'm still on the line
for the return shipping. Live and learn!

Thanks for the help!
Juan