Sew Red For Women: Block 3

I find the blocks that are set on point, or diamond in a square (or whatever you want to call it) very challenging. I did one for the Summer sampler (I still need to blog about it) and this one. I am not sure what it is, but these blocks never come out straight, independent of how much Best Press I use.... (The setting triangles in this one were stiff!)

Here it is: