To answer the first posters question, if you use a hacked firmware, and leave the burn speed at max, it will burn at the drive's maximum. With the 107 this will be 8x. This is not a good idea with all media, read around and find more examples of what MrCrow, and stevvie have said about certain media's maximum burn speed. I have a 107, and never with any official firmware, have I ever NOT been able to burn at a disc's rated speed. From firmware 1.05 up to 1.20. I usually use Gradius' firmware, and just remove the rip lock, and leave the speed's alone, as 8x media is at a good price. As for pepsimax's question about going down in firmware, there is alot to learn about flashing your drive, but if you search on this forum, and here:http://forum.rpc1.org/portal.php
for a program called Dvrflash. It is a utility that will allow you to flash pioneer drives to any firmware, official or hacked, up or down. The power calibration error you mentioned can sometimes be poor quality media. Be careful, and good luck.