Maybe you could use some one-on-one help to recheck that your insertion technique is good. Do you have access to a certified diabetes educator (CDE) through your doctor's office? This is the kind of thing CDEs do. I'm surprised that the automatic inserter leaves you with a kinked cannula. Knowing that, I would suspect a bad lot of infusion sets. Although I think the Tandem customer service people would be well aware if that was happening.
If all else fails, you could return to try MDI, multiple daily injections. I tried the long acting basal insulin, Tresiba, this year and found it reliable and flexible. I used Apidra for my meal and correction boluses. I found the insulin pens to be easy and convenient to use. Perhaps this could help you and there is no penalty for trying. In fact, doctors can often give you insulin samples to try.
So, I would seek the help of a CDE to check your infusion set insertion technique. Then, if you're really committed to pump therapy, I'd try some other infusion sets. Finally, you may find that MDI works well for you. Many people choose MDI over pump therapy for a variety of reasons.
Good luck! Don't stop trying various changes to your current set-up. I've gone through this a few times and while I didn't like the frustration and uncertainty, it definitely felt better when I discovered a new method that actually dependably worked.