The scuffing on the backplate is normal as others have said.
OS has updated the bearings, but nobody I know of has recieved the updated version despite buying their engines recently. I believe if the serial # is 17000 (DON'T HOLD ME TO THIS) or higher it is updated. They may not even be in distribution channels yet.
If I were to buy new bearings, I would be buying TKO Cometition Development brand bearings. These are the bearings that come in the modded V-Specs from JP and EB Mods. They cost about the same as Bocas, but are a bit more trusted by most.
FWIW.... I've got almost 5 gallons on my Spec (and stock bearings), with NO issues at all. Even the included glow plug lasted more than 3 gallons.
Now I'm not saying nobody has had bearing problems, but I think the frequency of this issue is blown way out of proportion due to the internet. I race at MANY tracks on the East Coast and I've never met someone in person who has had these bearing problems. Everybody I've ever talked to that runs a V-spec says the same thing: "I've never had any problems, but I've seen that some guys on sgrid have had problems."
One thing you can do is remove the piston,sleeve and crank, then flush the oil from the bearings completely. Put the crank back in and slowly spin it in the case with it up next to your ear (somewhere quiet), You should be able to hear if there are flat spots or any grittiness to the bearings.