Those are small pieces.
Your flying geese units should measure 1-1/2 x 2-1/2 inches after they are assembled. What size are yours?
I am not a fan of cutting squares into HSTs (half square triangles) and QSTs (quarter square triangles) because my finished units always end up "skimpy" - at best - when I do that.
I have decided that the reason they end up skimpy - is that when I cut around a ruler or other template - the cut pieces are a tiny bit larger than the stated size - maybe by only 1/32 of an inch or so - but still a bit larger than the stated size.
When cutting up squares - I think the pieces end up "smaller" somehow - and then the finished units are too small for the other components.
My seams are pretty close to a "real" 1/4 inch and usually my blocks end up being fairly close to the expected size.
I have not cut strips with the June Tailor shape cutter yet - but I will check the measurement of them before sewing them together.