Yep, I'd reckon try giving those EBB bolts another quarter turn or so and see what happens.
I was touring Tassie in January and developed a click.... once every pedal rotation. I thought it was a loose crank - tightened it. Then thought it was a loose chainring bolt (one is loose and can't get it tighter).... tried that again. Still clicking. I rode for about 700-800kms with this click, blaming it on the loose chainring bolt.
Back home I checked the crank again and noticed a small amount of play in the EBB. Took out the tool and tightened the bolts. No more clicking
My EBB bolts are rather tight to adjust - none of this "do them up finger tight" that I've heard others talk about. Don't know whether it's corrosion, dirt in the thread or some metal obstruction in the thread, but I have to use the spanner to do them up and to undo them. This has tricked me out a few times when resetting the bolts to secure the EBB.