Special Training Method!

One of the things I'll notice is during kesa or gyaku kesa, the cuts are kind of scooped. If not scooped, it would be very flat or get stuck in the mat at a flat angle. Worse is that people will cut and turn the direction of the edge in the middle of the swing! Usually you can tell this by the direction of the edge at the end of the cut or if you look at the mat, there's a little trail left at the end of the mat part you just cut.

Sometimes it's hard to notice or see so there's a trick to practice this.

First, you get two business cards, and some tape. You tape the two pieces along the side of the blade on the monouchi part. The tape is centered around the mune and meets the two business cards, and another piece meets at the other end of the business card. Think of this as an extension.

Go into normal Jodan and swing. 

At the end of the swing, see if you can see the business card like so. 

If you can see the business card at the end of your kesa like this or if you're practicing in front of a mirror and you see this...

That means you're turning your edge in the middle of the cut. That leads to messy cuts. 

You would rather have....

or from your view...

Gyaku kesa is the same! This is bad...

That will lead to too flat or getting stuck. You would rather have...

You can do the same for sui hei (yokogiri) but I was too lazy to take pics. But you get the point! 

This will overall, reduce bad angles and help you just realize how your finish is just as important as the beginning of your cut!! Hope it helps! Thanks Aiden for your help.