Sounds like you're describing a "chisel grind". I have a P4 Squirt myself, but I've never found a use for it's small blade, never really looked at that part of it, and didn't even realize it had this type of grind.
Grinds:
http://en.wikipedia.org/wiki/GrindBelow is a sharpening FAQ. Scroll way down the page and you'll find some info specific to chisel grinds.
http://www.sff.net/people/pff/sharp.txt 
Previous Topic
Index
