Backstroke and dolphin kick practice

We practice today.
I did another 500 yard fluttery kick drill because I believe this is one of the several keys that can make me swim front crawl well. The timing is still from 2'40" to sub 3'.
My backstroke is not very good. I always turn to zigzag in the water. I also have a little breath problem while it is said in backstroke swimmers don't have to worry about breath. Water getting into my nose while I breath. I think the water is caused by hand movement. I think I still need to have breath rhythm cooperating with body movement in backstroke. This is what I am going to practice next time.