Have you seen this flash done on the xfx 7970 cards which didn't use the reference pcb.
What is the exact card? e.g black edition / double d black edition
I had a guy who i think said he had a black edition and got it up to 700Kh/s but i can't remember which BIOS he used.
Hmm i'm not sure about the HIS - i don't know anyone who has tried the BIOS flash for that card.
What is your hashrate on scrypt currently?