Correct. AID is just an UnleashX bootdisc. Slayers' is just an Evox bootdisc.
You can format partitions through RAW FTP commands also. However, I've never had a problem with Evox's formatting abilities, though I prefer UnleashX as a disc-based tool (for cache clearing, installs, etc.).
If you don't want to bother with a full auto-install package, perhaps consider making a quickie UnleashX bootdisc with some format commands on it (examples can be provided), IF you feel in the end that the formatting is the issue, and not the bios.
HOWEVER, my honest advice: The MuppetX can hold 2x152 bioses, so I would seriously consider using an X2 bios. Better IGR, easier to edit, better pretty much everything. You aren't limited to the Evox M8 bioses anymore, even if you have a 1.6/1.6b motherboard since the X2.50xx series came out.