Well I think going to FlashFXP instead of my old ftp program with
Slayers 2.5 solved my biggest problem.

So far everything's working, seeing about 300GB. Old
Slayers 2.1 would not work (some apps unavailable) with the new bios, but so far 2.5 seems fine except for some reason it and my old ftp client didn't like each other (evox-ftp bug as said by Evobex). (thanks, I can stop pulling my hair out now).
Still looking for info on how the
slayers hdd-lock/unlock utility works and why it may be that I can't lock my drive. Is there a way to use the MS dvd-remote dvd player running off the chip?
Thanks to Slayer and all that helped make huge hard drives possible, been wishing for this for a while now
I'm still confused how G could be useful if HDDloader won't see it or use it, maybe it's for future uses?