After checking, 150kb is the LSI Logic one. BusLogic would only be 30kb, maybe small enough to include.
Before trying IDE, could you post lsmod output when booted with the BusLogic SCSI choice (and the scsi extension loaded, e.g. via the edited tinycore.gz)?
edit: If you have the time, could you also post the same with the paravirtual scsi choice? That one would only be 8kb.