Download the small free editor:
paint.net.
It can handle *dds files.
Download some 3k yard BO.
Open the sub*_shp_dds file with it.
There's an effect/tool or something that you can use to rotate the 1 degree off.
I know this cuz i've done it to my bearing plotters. I noticed the same
"1 degree off" issue as I was doing my own version.
Im on my friends PC atm, so I cannot help you right now.
But when I get home I might take a peek on what I got and perhaps
upload it here some days later.
Laters...