I used to have frequent leaks until I found out about tunneling. My solution is to limit the amount of a bolus given at one time. I’ve found a max of 4U works for me, but experiment to find your own limit. E.g., if a bolus is 6U, I deliver 4 now and extend the remainder over half an hour.
When a bolus is large and/or I want more than 4U up front, I simply inject with a pen and use the pod just for the decimal amount of the bolus.
Since I started doing this, I’ve never had a leak.