You know what they say... If it ain't broke, fix it until it is.

I suppose if it is broken, then the quote might say something about how if it is broken, then fix it the wrong way until it's even more broken?

Anyway, congrats on the faster G4, hopefully your sawtooth hack works, or you can find the money to buy the proper PSU for it. I'd go the proper-PSU route anyway, especially if your sawtooth still works.