^ Agree, 9's are always best with Floyd Rose Bridges IMO.
I've never tried the bridge on the MSG (nice guitar btw!), but I tend to avoid custom innovations in case I need parts (the ESP Sinclair/Synclair was a nightmare).
Trevor Wilkinson nails the reason why the Open G on Vintage Trems never stays in tune - I'll try and find the video.
I have a T-O-M and Locking Tuners, but it still doesn't do what the Floyd Rose does, as I can do 10 bendy solos on the Floyd and it'll still be in tune.