There's a few head-scratching things going on here. I'm giving up trying to figure out your front end. Let's talk about your rear numbers. I assume your latest alignment printout is from a Mitsubishi dealer?
As the owner of a 2015, one thing that jumps out is the rear toe specification on your latest alignment sheet. It says the valid range is 0 to .20 degrees...
That is a tighter range than Mitsubishi has been using since 2014 (a good thing in my opinion).
The rear toe range for 2014-2015 was wider: -.03 to .28 degrees....
Based on the "new" specs on your alignment sheet, my rear axle is now out-of range!
You are correct when you look at your rear toe numbers. It was toed in by .25 on the left side when they first hooked up the alignment heads. Someone leaned on the car or breathed on the alignment machine and somehow the final left side reading became .20 degrees and is suddenly within spec....their test started at 0.25 and 0 and ended at 0.20 and 0.05. Not sure what is up with that. Shouldn't this NOT be changing?
You are in a bit of a pickle. Unless the guys at Pep Boys are completely incompetent (certainly possible), how did they come up with that .34 degree left rear toe reading?
The left rear toe reading of .34 from Pep Boys is a problem.
The left rear toe reading of .20 from the dealer is OK.
So which reading is accurate?
If this was my car, I'd seek out another shop (a good independent place) and get a third opinion on the rear axle numbers. If you don't want to mess with it, then just keep an eye on how that left rear tire is wearing. You have 50,000 miles to get a replacement axle if you need one.
FYI...
My left rear wheel has a positive toe reading of 0.23 degrees. I have 80K miles on one set of tires that have been regularly rotated. So you don't have to have a perfect rear alignment...but it certainly helps.