B7S9 has no advantage over T9 or P9 other than it's good for the cheap media that is sold over-seas (China I think?) and it disables the WOPC if I remember reading on that firmware correctly. I'd rather have my WOPC enabled and working correctly since it does such an excellent job on the BenQ. As roypalma said, I'd upgrade to T9 (I have seen no advantage over P9 - I think it's preference and what people have gotten used to more than anything...) and unleash that media to a full 12x write speed.
And how could you even consider that result as being bad? Even if you ignore the Quality Score altogether the PI Failures is only at 166! That's awesome! I figure if I'm under 2,000 PI Failures I'm in good shape as long as the max stays under 8-10 or so, any higher than that on the numbers and I get a little nervous if that disc has the longevity to it that I'd like to see. PI Errors are awesome, of course, I've seen my burns with 11,000 or 10,000 PI Errors primarily on RicohJPNR01's burned at 8x but there is nothing at all wrong with 25,574! Your max PI Errors should stay below 280, your well below that and that disc should last a good long time if you store it properly.