Cat back exhaust install issues

Hi all. So I finally decided to start doing some mods to my '08 Tacoma and installed an LCE Pro Flow Exhaust today. I ran into a couple of minor issues, I was hoping people here might have some knowledge/advice. I got a late start, so I finished up right as it was getting too dark to do anything else. I'll work on finishing up tomorrow as I have the day off. Also, I plan on calling their tech support, but they don't open until noon my time.

The first issue is that I have an exhaust leak at one of the slip joints. It's a small leak and only on one side of the slip joint where the pipe is slit to create the slip joint. I think my best course of action will be to use Muffler/Exhaust Sealant which LCE recommends (and I used) to get a good seal on the slip joints anyways.

The second issue is that the pipe that connects to the cat doesn't slip over the little bit of pipe that sticks out of the cat flange. I don't know if this is normal or not. I didn't feel any exhaust leaks at the flange though.

Thanks.