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Many thanks for your insight.
As I mentionned before, there is no need for shorter nor adjustable endlinks with -20mm drop over stock, which is confirmed by the tangible and measurable fact that I had ZERO problem or noise with the exact same setup and stock endlinks for 15'000km prior to replacing them. My BRZ rides beautifully, zero understeer, steering is as direct as it comes (with other supporting mods). To me it was absolutely perfect and I'm used to Lotus, Noble and TVR steerings as references.
In your case, you have 4 degrees negative camber which changes quite a lot compared to what I have (and probably much more drop too), and understandably causes some rubbing on the wheel well. This is well known and documented, and the solution is indeed to put shorter/adjustable (for the drop) AND slimmer (for the negative camber) endlinks. I'm in neither of those cases fortunately as my setup isn't as extreme. Some people even relocate the connection on the lower control arm instead of the strut to get rid of the problem with a lot of camber.
I ended up ordering a set of new OEM endlinks last week, they should hopefully arrive in the next days. After taking measurements everywhere, I'm pretty sure my problem is circled down to 2 things :
1) The Delphi endlinks heads are bigger than the OEM ones by a couple mm both in diameter and thickness. This causes occasional light rubbing of the upper head (connecting the strut) on the wheel well on the right side.
2) The bolts on the Delphi are longer than the OEM's by 5-10mm, which causes light rubbing of the lower bolt (connecting the sway bar) on the lower control arm on the left side. I had not noticed that the first time I checked under the car.
I can't confirm that but I think that those 2 different problems on each side cause the sway bar to slightly slide left and right, making the rubbings more pronounced depending on the particularity of the roads I drive.
All this leads me to think that in no circumstance should those Delphi links be used as long as you ride anything else than stock height and alignement. I'll post the confirmation and actual measurement when everything will be solved.
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