I also have the same remote filter set up as you are describing and by the sounds of your post, we also had similar issues. I was fighting a leak for quite some time.
Ended up tightening the hell out of it and it finally stopped. I pray that it doesn't come loose and dread the day I have to tinker with it again.
This was about 3 years ago now and have not had any issues with it, was a son of a gun to get it right though
You never know... we have not had one bit of problems with the Canton remote adapter. Can't recall if we had to torque it extra hard or not. We DID make sure the filter plate on the block was sealing well before we put the Canton piece on.
If I was the OP, I'd try this first...extra torque on the Moroso adapter's center bolt. Just increase it a bit at time and see. You might be able to grind an open end wrench thinner and bend it a bit to get in there.
