Just watched some of your videos Janet. I appreciate some of the methods of practice for side breakfalls could be handy for beginners.
But if you're going to demonstrate what is essentially a judo fall then you should also focus on having the other shoulder come around so you essentially finish on your side and not on your back. That is continue with your shoulder coming around in the movements.
Many students when practicing side flat fall backwards into the movement causing a whiplash effect on the spine. Good side ukemi involves falling FORWARD into the side flat. In this way we have a slap and a foot on the floor before our hip lands with head tucked.
When I first started learning side flats, we started from a crouch position and slid one foot across our body and picked a spot on the mat in front to slap. Also, for hashi ukemi, we practice a headstand and kick our feet over to land on toes so as not to have our hips land on the floor.
When you do get a good sweep, you are required to fall pretty much directly down, so it essential to to make contact with the hand on the mat with a slap, before your hip gets there. Essentially the slap is to take off momentum from the fall.
Also, when you are doing your circular movement you have a massive flat spot in your back. Practice rocking backwards and forwards like a rocking chair keeping an arch in your back or again your faced with whiplash in the neck area and its hard to keep you neck tucked and control the momentum.
Crap, I just watched more of your videos and well, ....ummmm. Please check out something like Donovan Waite, meeting the mat or something like that.