DVDInfo indicate the Media ID for these media are RITEK R02. Is this the same as Riteks G04 like it was mentioned above?
Well, obviously its not. Different media IDs equal different batches/manufacturers etc. Though that doesn't necessarily mean that the disks you bought are of worse/better quality. Only personal experience or anectdotal evidence will tell.
I think that the standard Ritek MID coding is "G" prefix for -R media, and "R" suffix for +r media. So your +R R02's are very different to -R G04's.