Cannula is bruising when sitting down

I’ve found that the cannula on my abdomen area bruises me and starts itching and gets red when I sit down for prolonged periods of time. Unfortunately, the abdomen is my best site in terms of absorbtion and results. Is there any workaround for this? I’m using 8mm sure Ts

I use a shorter 6mm because they bend less, and I insert on a angle manually instead of the spring loaded ones. I use my hips and my sides with great success. I also use my butt but only where spots that don’t get sat on.
My abdomen has been scarred from all the years of use, and also my abdomen stretches and bends so much that the cannula often comes our or bends over.
I’m much happier anywhere but my abdomen.