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About 3 mos. ago I did a front brake job. Put on new rotors and pads, greased the wheel and spindle bearings and put in new seals, and installed Superwinch manual hubs.
Before the brake job the truck would pull to the left when braking, but after the brake job it had smooth even braking.
Now it has gradually become just as bad as ever, pulling to the left.
While drving there is a very slight pull to the left if I let go of the steering wheel on a long straight stretch of road to see how it tracks.
The tires are in very good condition but probably could use balancing.
You have a sticky left caliper, when you did your brake job you mentioned replacing the pads, turning the rotors, and repacking the bearings, you probably ran the pistions in your calipers back into the bores with a large "C" clamp like everyone does, you may or may not have felt that it was harder to do than the one on the right side, when the piston is all the way in it is/was in a "fresh" area of its bore letting the piston move freely until it got to the "old" area caused by wear on your pads, starting your pulling problem all over again.
My advise is to replace BOTH of your calipers, and bleed your system, and you'll be good to go.
I had the same problem with my 94 F150.It's because the factory calipers have steel pistons and or sleeves. The first time my calipers start acting up, I replace them with remanufactured ones. They put new Stainless steel parts in, it never happens again. They aren't expensive either.