Leaking issues in my 200 4R - any gurus available?

Last year I changed the filter and pan gasket in the 200 4R because it had been two and a half years and the pan gasket had a minor leak. I removed the top hat filter seal and installed a new one, then installed the filter. I had some leakage and had to retorque the damn nuts a few times, then it was fine. Toward fall last year I had a ton of smoke when I came to a stop and I could smell transmission fluid. Got it on a hoist and didn't see any major leak. The next half dozen rides it was fine, no smoke and no leaks. One of the last rides of the year I was coming home on the highway. It was late and the road was clear so I brought it up to 140 for a quick time, then ran at 120 for a few miles and 100 for the last two. When I got off on my exit it was smoking bad again. I got it on the hoist and no fluid running down anywhere, though the headers obviously had burnt fluid on them. Flash forward to this year. I've had it out a dozen times and it was fine. Raced a few times and everything was great. Two days ago I'm loafing along at 55 and I suddenly see smoke billowing out behind me. I pulled over and could see a steady drip every 1/2 second or so from the front passenger side of the pan. I didn't want to take a chance so I had it towed to my work. It looked like it was the pan. I put on a new gasket and used a little silicone just in case the pan wasn't true. I cleaned everything off and ran it for an hour in gear and not a drop leaked. I drove home forty miles and when I got to my exit it was smoking just a bit. When I got home I looked and it was dripping at the same spot, though nowhere near as bad as the night before. This morning I drove it to work, slowly and carefully. I let it shift automatically instead of manually shifting. It was the same 40 miles. I stopped for gas and saw no leaks. I got to work, no leaks. I went out after a few hours, not a drop on the ground. I now suspect it is leaking from the vent on top of the transmission and running down. I suspect it may be heat related. I wonder if I did something funky with the filter? It drives and shifts perfectly otherwise. Anyone have any ideas? Sorry about the lengthy post, but I wanted to get all the details out there.