I do not succeed to understand the reason why for you this firmware does not go well.
Here I have not had problems at all and no coasters until February
The my first CD burner has been a Philips 2x, taken nearly ten years ago, therefore task of being in a position to understanding if something works or not. From February I have used many brands of DVD.
Some days ago I have taken 200 Dvd-r Princo 4x in offer, already burned 40/50 pcs... no coasters, no problems. My stand alone players can read them as well