As shown above, there are huge improvements in the burn quality of Optodisc OR8 media with 1.58 versus 1.57. I burned this media specifically as it burned with marginal quality on 1.57, with similar results as posted above. When burned with 1.57, there PIE error rates were about 10 times higher and the PIF rates about 20 times higher. Nice work Pioneer!
Unfortunately Prodisc R04 is still only supported at 12x albeit with the PIF rates cut nearly in half and average jitter about 1% lower compared to 1.57.