Definitely a Merkur issue. I've only bought two Merkurs since I've been wet shaving, and both had issues. If you want quality I suggest getting your hands on an Edwin Jagger DE86, 87, 89L or a Muhle R89.
I just got my EJ DE89L in the mail yesterday. It's definately got smoother lines than my HD. Its like comparing a Chevy to a Cadillac. I'm going to take it on a test drive this morning.
Clayton