Day-V

I have a very small propane leak between the gas pipe and my oven. A Bosch specialist found the leak which is either between the flex line and the connector fitting, or the connector fitting and the gas regulator on the oven. There was a leak at the other end of the flex line previously--where the gas pipe enters the house, so I took of both connectors--from the pipe and the one on the oven, and put on a new flex pipe. I used pipe dope on both connectors, but, as per instructions, not on the threads of flange end where the flex line screws on. Is it possible that I overtightened these pipes? Again, it is a very small leak, undetectable with soapy water. I can't imagine what else I can do?