Stem is Too Short

I mentioned ealier that I think the 9cm Salsa road stem I've been using with the mustache bar would be too short with a straight bar.
I was right.
It's not so apparent just cruising around, but it is a real concern going down hill and braking; I got the distinct feeling of falling over the front of the bicycle! The bars are too tucked in under me and my arm angle is too acute, like 80 degrees I'd imagine.
Steering too is a bit quirky. A longer stem will slow that down a bit.
SO I'm planning on trying a 11cm Salsa 90 degree. I like the look of a 90 degree stem and this'll stretch me out a bit longer.