I have a Mustang seat and it doesn't sit on the metal clip on that vent hose. It does touch the rubber hose below the clip though, but only slightly. I believe I wore the rubber hose while inserting the front tab of the seat into the bracket several times one day while fitting the saddle bags. I was probably pinching the hose, wiggling the seat around to get it in place. I'll be keeping a watch on it to be sure.
The bags' throwover straps caused the seat to sit high and I had a hard time getting the bolts into the rear. Pushing down hard on the seat, I finally got them to go in, but I stripped out one of them. I'm dreading the next time I have to pull the seat off. I had to push down on the seat to get the bolts in BEFORE I put the bags on, and it's considerably worse now, with a double thickness of "leather" under the seat. I have one bolt all the way in, and one bolt halfway in and it just spins.
When I installed the AGM battery, I cleaned the connections with emery cloth, including both sides of the ground connection. When I first encountered the stalling, which was the first ride after installing the battery, I ran Seafoam through the tank. The next ride was fine. After that, however, the problem surfaced again. The difference seemed to be in the amount of time the bike sat between rides, which is several days when the trouble appears. So, it's a mystery. It's as if the battery loses just enough charge while sitting to cause weak ignition, and recharges while running on the highway. But it hasn't been sitting more than a week between rides yet, so that's a concern. And to answer your question, Hyper, no I haven't had the battery load tested. I was careful to make sure all the connections were tight and clean though.