Steering feel at higher speeds

[Nmbrsix]

The car has 73k miles on it currently; I bought it in June 2015 with 69k.

When I took it to Tru-Line, I instructed them to look for any suspension components that looked worn and replace them ahead of doing an alignment. I also replaced/upgraded the struts at that time as one was leaking.

This is what they replaced:

-Both front track arms
-LF wheel straightened (removed slight vibration at 70+mph)
-LF wheel bearing (suspect the bent wheel killed it)
-LR control arm (bad ball joint)
-LR track rod
-All 4 struts replaced with new Bilstein HD's; all related hardware replaced with OEM components (strut bearings, etc)
-New Contis have around 1000mi on them now
-4 wheel alignment was performed by the best shop in Seattle (who also did all of the suspension work ahead of the alignment)

All of this work has been done in the past 2400mi, or two Summers of driving. The car is primarily a Summer time highway commuter for me; it hasn't seen any DE/autocross days or anything that would have worn the new tires in an irregular way. This behavior was also present with the old tires and alignment.

I'm suspicious of the tie rods and front control arms, too...is there a standard way to check for wear on them?