UJDA730 went from 16x CD-r to 8x after patching

Have a Toshiba Satellite with the UJDA730 in it. Before I used mpatch it burned CD-r at 16x, now it only does 8x. I am region free and everything still works but I want the 16x back. Anyone have the original rom for this drive? Or is there an updated region-free out there that gives me back the 16x?

Also, how do you produce a rom? I mean, I can dump the rom but what can I use to edit it myself? I’d love to learn.

Thanks for any help you can offer.