There are a number of things going on here which may or may not be interrelated, but you need to start proving some knowns and unknowns before trying to tackle all of the possible problems.

The first known or unknown you need to prove is whether the floppy disks you're creating will actually boot this machine. Just because a floppy will boot a PB150, doesn't mean it will boot a PB180, particularly as the System Enablers those two Powerbooks use are different. The 150 uses the Powerbook 150 enabler and the 180 the 131 as you've correctly identified.

Someone else was having problems booting a PB180 and it's worth reading through that thread to see if anything there will help you -

http://68kmla.org/forums/viewtopic.php?f=10&t=18735&start=0

The disk images I supplied that person came from an official PB180 Install set, so there's a good chance the Disk Tools image from that set should boot your machine. The fact your PB180 is spitting out disks suggests one of two things 1/ The disks aren't the right ones to boot that machine or 2/ There's something wrong with either the disk media or the floppy disk drive.

The only way you'll really know is to start from a known good PB180 Disk Tools disk.