And you've ruled out enlarger leak? I capped the lens on my enlarger and placed a mirror on the easel. I was shocked at the amount of light seeping through from the lens stage, and from light head.. Black cardboard masks and tape took care of it. No more fogged whites.
I have found solution....
I reduced the exposure ( amount of light) with the build in ND filter of my Durst M605 enlarger...
This did it..
I'm happy
f/11 is the sharpest aperture on all my Nikkor Lenses. f/8 is sharpest on my Schneider. I always print at those apertures and then reduce light intensity from the head.
The OP seems happy that he has the solution to the cause of death so to speak, so the remaining post mortem examination by us may be of no interest to him but in his first post he seemed to suggest that his aperture was f11-22 but the statement was vague. If he needs a lot of ND then this does suggest that his times for test strips (20,40 and 60 secs) are completely out of kilter with the degree. of luminance on the paper such as might be the case if his aperture is wide open or nearly so. It might explain why he had to snatch his prints to prevent them going black.
On the other hand if he is happy then we can be happy that he is happy. I on the other hand remain frustrated that the complete puzzle hasn't been solved in my mind and he has not been set on the right path as the fire and brimstone preacher would say so, no, I am not happy.
I feel the same way as I would if I had been slowly trying to solve an Agatha Christie murder by the powers of deduction and someone looks over my shoulder and says: "It's OK, the butler did it"
Should I feel like this and is this selfish on my part? I don't know but I'll probably get over it.
Gosh I feel better already now that's off my chest. It is after all just another story, moving the wagon train West.
pentaxuser
OK I think you think this is a form of police investigation so I will end my investigation by saying that if my statements on your aperture, filtration and additional C filtration are all correct then something is clearly not right. Yes you may have rescued the print but I thought that the best solution was to investigate why you have had to do what you have had to do to get a print and then give advice as to how darkroom printing can be made better and easier.Sorry i hope this is no police investigation.
I told you everything about the whole procedure i think.
Here's what i got from print.
The voltage regulator may be shot and the bulb will burn out faster.
Thx for your message. I have more hitchcock images..www.lievenvanmeulder.com , but all digital. 
Will try to use the Magenta filter on my enlarger tonight to cut down even more the light...
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