Couple tjings.
JLT is huge improvement over K&N.
Exponentially better.
So much so that you should now get new tune (Custom highly recommended, trip to Pete’s) to take advantage of the JLT.
Tune that supported K&N is not enough for JLT.
As SVT4 said, BMR very good for LCA’s.
You say you have been replacing on warranty.
Are you running OE LCA’s still?
Those are sub par at best.
BMR have grease-able bushings.
Very well made.
I don’t know why your ball joints don’t hold.
I’m still on original ones on my 06.
CC plates are very good investment as said by Trevor.
Research and finding good alignment shop also good idea.
Does not have to be privateer.
I get everything done at dealership but always same tech.
I have theory on why premature wear of tires.
You mention you are running 20 inch wheels.
If you are still at OE overall diameter, then there must not be much sidewall to your tires.
This means they are stiff and have little compliance.
This can lead to increased wear.
As Gerry said, toe in on driver side could be interpreted as a bit high in comparison to very little negative camber on that side.
Opposite to this, your passenger side, has the most negative camber but the least toe in.
General rule, with high negative camber, a bit of toe in is good to prevent premature inner wear.
I share with you here my settings.
I run 18 inch wheels with more sidewall.
I get very good wear for having this much negative camber.
I have MM CC plates that allow me to have both sides pretty much mirror each other.
Last, you mention having Boss 302 springs.
These are substantially stiffer than OE springs as well as lower.
This means your OE dampers are not able to adequately dampen these springs.
This causes loss of contact between the tires and road.
Probably, but not limited to, choppy ride, poor or loos of traction, both front and tear.
Rear is easily felt under acceleration on rough surface.
The front, however, may not be as easy to detect.
Could present as understeer, and would accelerate front tire wear as well.
I agree with your thought of upgrading your dampers to address this issue.
So, several factors can affect your tire wear, not necessarily a single or isolated one.
I would suggest the Boss dampers as they were engineered for your springs, or, you can’t go wrong with Bilstein B6 dampers.
Every part I suggest here, I run on my car.
The BMR LCA’s. The Bilstein dampers with Ford Racing P springs. 1” drop all around.
