My PPQ just came back from Walther. It has a brand new black friction coated safety plunger. Didn't cost me a cent. It was smooth as silk until I cleaned and lubed it, after which the problem returned almost worse than before.Thicker lube helps until things get smooth from use. Some have gone as far as nickle plating the firing pin block for around $15.
Then it dawned on me to really take Balance's words to heart and I got some Hoppe's HBGG black gun grease. I cleaned off the thin oil and applied it just to the trigger bar tips and the top of the safety plunger.
Bingo! The trigger became instantly transparent. The take up has no sensation at all, the wall is even more definite than before, and the break is (as they say) like glass. Best of all, it has lasted through 100 rounds with no sign of recidivism.
THIS IS WHY I BOUGHT THE GUN!!!