When my tank bag is loaded for a long trip, I can lean my chest onto it for some relaxation when I'm riding at speed on a long stretch of highway, or for stability when wind is gusting. You may discover the bag's height is useful in that way. The Brick's fuel cap doesn't seem to have enough rise to interfere with what is in my bag. To fuel up, I just un-clip the front fasteners and flip the bag on its pad backward exposing the filler cap. If I had a tea service set up in there, doing that could be problematic.
The waterproof fabric of the Givi is a plus. I need to use a rain cover stored in a zippered pouch at the front of my bag. It can get a little hectic in a sudden downpour when I haven't been paying attention to weather.
Good luck with it! Thanks for the photos.