Alright....congrats Braxas. Sorry I didn't get back here sooner to reply. Are you connected via firewire or USB? If you are on USB, you might want to limit your burns to 12X, because 22MB/s probably will top out around 15X. If you are getting 22MB/s on USB2, then try switching to firwire, you might be able to get 23MB/s, which will be fine for 16X burns.
I am using the 110904 firmware for the PL3507 chipset, and 47L9 firmware for my BenQ (there is a newer firmware 47N9, but I haven't switched yet). I am connected via firewire and can get 23-24MB/s for my burst rate. I get 21-22MB/s when connected via USB2.