You can probably use cdspeed, opti drive control or dvdinfopro to test the quality of the burns your drive is making on those discs.
Do so, scanning at 4x, and then paste a picture of the result.
Ritekf1 aren't good discs. Ignore that they've got sony stamped on them, that doesn't mean anything and sony could choose any mid/dye they want - probably the one that makes them the most profit at the time.