Mine Bessa R2A had infinity alignment off from time I bought it. I was said it is due to short RF base. I checked by focusing on plain subject (grafiti on wall) with largest aperture of lens - f2,5 - (camera on tripod of course) on closest focus, 1 meter, 2 ,3 ,5, 7, 10, and as focus was allways good, I simply forget about it. It was 2 years ago, and I have no problems with focusing.
Me too didn't find nowhere how to align Bessa. I found for Konica S2 Auto (have it too), but not for Bessa. I think it is simillar procedure, but I need manual how to open top cover...
Sorry for not be able to help and good luck Andy...