You should square up your hst's before making the block. It might have been that you are sewing a full 1/4" seam. You can't really do that on diagonal seams. Try a scant 1/4" which is just about a 3/16" seam. It will work out better for you I promise.
p.s. nobody gets the points right the first several times unless it's just a fluke. Don't get too upset over it, you're still on the learning curve. Also, the focus fabric goes where ever you choose to put it, there is no right or wrong place.