Edited by author on purpose.
Lubing the interface will promote dirt and dust adhesion hence making the matter worse.
1.) How do you measure the spoke tension?
2.) Is the hub staightpull or j-bend?
3.) Are you able to replicate the sound on purpose pushing/pulling on the rim/spokes by hand?
I have the same issue. With my bladed spokes on my rovals. I havent tried yet, but kinda think some wax lube may be the best option as that wont collect dirt.
- Anecdotally by hand, objectively with a Park Tools tension gauge.
- Straight Pull.
- Yes, I can replicate the creak. I can also make it go away by cleaning and lubing…at least for a while.
Very interesting issue, and one that I had on a wheelset some years ago. Just my theory, but I think this is more likely with straight pull.
my theory as to the cause is that with straight pull the hub when under load applies a slight bending force to the spokes, as well as the usual linear (along the spoke) force, meaning the spokes can move slightly against each other at the cross point. Over time, the movement wears the spokes a little, and eventually they move like tectonic plates; i.e. the wear creates a ridge, and then when the wheel is put under load instead of the spokes rubbing smoothly the don’t rub at all until the bending force reaches a certain point and then ping, they move against each other suddenly, causing the sound.
I ended up replacing the spokes, and to avoid a potential repeat, I didn’t cross the spokes meaning they don’t touch.
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Sweet.
Want to relace some wheels for me? 
I have this same problem with a set of ENVE M25 mtb wheels, with bladed spokes. I’ve been told the same thing - apply a little tri-flow oil periodically. It’s a super annoying problem, but I love the wheels - nothing else rides as nicely for me, so I accept it. 
Are the spokes black? I’ve heard the problem is more common with black spokes.
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Yup. Black Sapim CxRay