Yo.
So first thing: be careful with and control your alpha channel.
With the type of stuff you are making you don't even really need one.
When it's turned off, this is what your file looks like:
The other files have the same thing going on.
I recommend you work with an RGB file until you need to use A.
Snap your stuff to a grid.
Especially stuff like this that is all variations of similar objects.
It will save you a lot of time moving things around and making new stuff:
Here's some more thoughts:
Logged
And knowing that it is, we seek what it is... ~ Aristotle, Posterior Analytics, Chapter 1