BTW,
Steve, I am really glad that you have sorted out things and are enjoying your G-70; I am 100% sure that, if you sell it (or sell the Tyros 2 for that matter), you will have seller's remorse afterwards...

I have four SRX cards in my Fantom XR and have installed the 07 (Ultimate Keys) into the G-70 and have started experimenting with substituting sounds (like a bass) in the styles: the results are amazing!
I agree with what others have said that the G-70 should have sounded great out of the box since the very beginning, but it's true that it has a great potential, even if it requires a lot of work from the end user.
Have you tried the converted VA-76 styles already? Whoever did the conversion, did an excellent job indeed: they sound great!