Good topic!
I have to do the foam trick for the internal cables. It makes really noise.
For the rear shifter cable, I didn't use the internal cable guides, but I'm running the full hose through the frame. I drilled out the back and front cable stop to get the full hose through. This way it make no sound at the back (but in the top of the down tube).
Got a small noise issue when steering really quick. The solution for this was to put some extra shims between the headset cap and the lock ring. Started with grease, but that didn't workout.
Seat post noise issue is easy to solve: clean up the seat post and frame. If the seat post wiggle (?) a little bit, use some hair spray to make it a little bit thicker (three spray sessions). And then use some carbon paste. Tighten the seat post clamp with 4 nm, with a max of 6 nm. This works so for good for me.
My wheel set made some rubber on rubber sound. Couldn't find it in the first place, but when opening the hub, getting of the conversion adapter, I found a small rubber closing ring. I putted some grease on it and now it's silent.
Creaking crank needs definitely some grease or a new bottom bracket bearing.
Always clean up before greasing.