Not sure how you're soaking your head, but here's how I do it.
Take a coffee filter, cut in half. Thoroughly soak in cleaning solution (always keep Mutoh Cleaning Solution on hand). Put this over capping station, move head over it, lower head height. Leave overnight.
Then run a few strong cleanings and see what it does.
Also, check the lines on your capping station. THOROUGHLY look them over, the Falcon was horribly notorious for having them gettting caught in the gears and getting cut, effectively cutting off your vacuum, thus stopping any ink from being delivered.