MIMF

For a tenor uke, should I go less than 1.8. How thin would still be OK?

It's 1.8mm, 300F, metal on both sides while bending. It didn't seem hard to bend, like some other woods I've tried, it just flaked like this.

How do you test for runout? (Obviously didn't do this)

A friend recently asked me to build him a uke out of Douglas Fir. I've had a lot of success with other woods, however this seems to flake and become very brittle. Does anybody know if there's a way to stop it from flaking as shown in the picture? Is it too much water? Too little? Too hot? To cold? O...