90 degree adapter leak

Cudatom are you sure it's not running down from the back of the valve covers? When you say it doesn't leak when cold yet it has 80 psi oil pressure but leaks when you drive it, sounds to me like it's something other than it leaking. I've had valve covers leak just down the back side and it runs right down onto the filter area making it look like it's what's leaking. Next time it's cooled down run your hand down the back of the valve cover and head and down to the filter and see there is oil there anywhere. If it's dry down the back side check the oil filter itself to make sure it doesn't have a pin hole in it.