yer its come up nice,I just think the G10 alone would have done the same job, saving you alot of time.
G3 is very very abrasive, and I would say really its only use is for flatting new paintwork, G10 is more than sufficient for paint renovation. (the less paint you remove the better)
Alternatively there are better products on the market such as megs, 3M, menzerna (although you sometimes find menzerna is a bit of a pain in cold weather)

What rotary hae you got?? what pads are you using??