[MacJunky]

Ok, I dealt with it by hand&ear. I figured that I may as well play with it so I got a fine tipped marker and marked the default adjustment screw positions and with a commercial tape playing went at it with a screwdriver. I used the most recent commercial tape with the least use I could find, a big shiny tunes 6 tape. Please don't laugh, when I got it I was not into the whole music thing so I did not know what I actually liked and did not like very well. It was purchased as a part of initial testing.

Anyway, I did not care for the majority of it(the wussy/wannabe rock and rap) so it did not get used much and thus in my opinion made a good candidate. I just played it in each device I had then tried to make the KD-55 match the others that all sounded basically the same. Nothing fancy I know, but after that I played the previous KD-55 recording in all the devices to make sure it sounded the same across all (Using only one seat of headphones directly connected to all devices). after that I made a new test recording on the test tape and tried it in everything as well including my sister's car.

Seems I was very close to spot on but the deck in my sister's car has just slightly different alignment than the GX-ASX and RP-1830A. It is easy enough to compensate for that though if I need to record anything else for her and want as close to perfection as possible, at the moment it sounds good enough anyway. There is no bloody way I am digging the deck out of her Cavalier for adjustment unless I absolutely have to.

So, in the end about a bit over a full clockwise turn of a screw and all is working nicely. :P
I should have done this sooner.