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When printing an overhang test with stock cooler remember to print one facing the cooler and away from it. It cools good but from only 1 direction, It also blows a lot of air right on the nozzle that should go to the print. When doing detailed prints with lots of overhangs or thin supports it's also best to lower your temp slightly as well but no designer should ever make a model that relies on no support past 65 degrees. I prefer https://www.thingiverse.com/thing:2806295 as my test.
For the strain relief hitting, that will happen with most aftermarket part coolers, Enders stock strain relief was designed for bed height near max. My reply to TheCrow163 right below this covers it all - https://www.thingiverse.com/thing:3063046.

*MINI* All In One 3D printer test
Strain Relief Ender 3 Bed wires
by Filboyt