Sounds odd... try reinstalling NBI, more specifically the bootloader. I'm not the best person to answer on this.
What I can share with you is that RANDOM kernel panics, at least when they happen on real Macs, of which I own several and service hundreds, usually indicate a legitimate hardware error.
I hope this is not your case and that there is something off software wise, especially considering the BIOS settings issue you mentioned. But that I will leave to the hackintosh gurus.
Dell Mini 9 | Mac OS X 10.6.1 | 1 GB RAM | 32 GB RunCore SSD | NetBookInstaller 0.8.3RC1
BIOS A05 | USB Wake: DISABLED | USB Legacy: DISABLED | Bluetooth: DISABLED (using USB BT) Current issues:
BIOS legacy auto enabled after restart | Boot error msg re: hibernate | No restart after sleep | Unix files appearing in HD root Temp solutions:
NBI 0.8.3 speaker out only