Couple of thoughts:
Have you done basal testing? I don't do it much anymore, but when you first begin pumping, it might really help you get those basals worked out better. You can have many different rates for different time of the day, so if you need more in the morning, bring it u., Remember that when you program a basal, it will lower your glucose readings over a four hour period, not immediately. So if you readings are starting to rise at 7 am, you might raise the basal beginning at 5 to start and see how that helps.
Are you confident that your carb to insulin ratio is correct? That can also change at different time of day.
Finding the right insertion spot, as well as the correct cannula can take some trial and error. Contact the pump folks and explain your problem. They talk to hundreds of pumpers everyday and might have some good ideas. I know mini med sent me a bunch of different types to try.
Are you brusing around the cannula or just feeling bruised? If you are bruising, I would call the pump helpline or your pump coach, if you have one. Maybe you are not inserting it quite right. This could also affect insulin delivery, so I would check on that.
I am also a little "pudgy." I try to place the cannula at least and inch// inch and a half below my waist. That way it does not get disturbed as much by clothing.
Moving to a pump is a huge lifestyle change. For me, it has been a godsend, but you need to perserver. Talk to people (coach, doctor, pump helpline, etc) as well as here on TU. There may be a real simple solution. Hang in there. I am confident you will be glad you did.