An alternative to overspeeding your DVD+RW media would be to polish them with sandpaper, cut them to pieces, and burn the remains with a blowtorch. :disagree:
Seriously though, you can't overspeed re-writable media such as DVD+RW/DVD-RW/CD-RW, and if it were possible to somehow do it anyway, the media would in all likelihood be destroyed.
If you need faster re-writable DVD media, buy some 6x DVD-RW or 8x DVD+RW.
Or you could forget about the re-writable part, and use write-once DVD+/-R media instead.