RK05 data problems with misaligned drive?

Hi folks, I'm just reviving a completely misaligned RK05 drive. I want to get it fully up and running and tested before I use an alignment pack. So I started debugging and got it to the point that I can play with the formatter. Here comes the question: The formatter (RKLFMT under OS/8) threw MANY CRC errors when reading back the freshly formatted disk. Changing the head cables at the drive proved that the problem is only with one head i.e. the failures change "side" when you change the head plugs. Now I ran the test several times. With random failing disk addresses. And they decreased and decreased... Now I've run two error-free formatter rounds. Could it be possible that new data on new tracks (keep in mind that the drive is actually misaligned by means of mechanical alteration!) suffers from interference from old tracks? That's the only reason I can see for this kind of behavior. On the other hand that would mean that I'd have to degauss the pack before I ever could use it reliable again. Any ideas? Kind regards, Philipp :-) -- http://www.hachti.de