You still have a head problem, but it might not be guides/seals related.
Over the year I have seen many of these heads with internal oil leaks. Possible places are the ball adjuster platforms. They screw into the head and the bottom of the hole is either the intake or exhaust runners.
I have also seen a number of guides leaking around the outside, between the guide and the head. Sometimes when the guide is removed a groove is galled into the bore. The new guide doesn't seal.
I have also seen many guide seals installed improperly.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician