Very even markings on the spark plugs, looks quite healthy to me.
I may have missed it, however is your sump and catch connected? If so, perhaps block off the sump to catch can vent/drain and see if you get less oil consumption.
(Assuming the oil vapours have a bit more time to catch along the oil galleries/passage inside the motor and not continue as vapour out of the cam covers).
Worth a shot, I have a ball valve on mine so when I'm not beating it at the track the sump/catch can drain/vent is blocked off.