Perhaps you are right about the seams. I didn't have any problems yet tho..
I am painting in 3d environment so it's no problem texturing (unless I will have problems later, don't have a lot of experience).
I don't think the quality would change much since it's already 512x map, ant it looks pretty good I think..
I only did it with many islands so I could save more space on the map.
at the beginning when I was testing bakes, I did it with fewer island, they didn't fit properly so I didn't know what to do. I cut it few times ant somehow shoved it into map.. but at that time it was symmetrical by two axis x and y. I didn't really like it because all the scratches on the surface were symmetrical, wanted to change that so the count of the islands doubled...
I thought that it was ok that way, but if your telling me that it's bad then perhaps I should go back again. Damn more work..
I appreciate for your comments, that way I can learn something new. thank you