130 flights is a bunch of flying...wow!! I have probably half that many on mine. I use a 14 oz tank which is enough fuel for nearly 3 Masters flights; except my flying buds start to bi....complain when I start the third sequence, so I cut it "short". I've timed myself during the typical flight of two masters sequences...16 minutes and I have about 3-4 ozs remaining when I land.
I will change back to the original 11 ounce tank I started this journey with to be a good neighbor to my buds.
Let's just say that "One thousand one, one thousand two, Roll..." now figures large in my vocabulary. I used to get the turnaround maneuvers mixed up, but now I can do them in my sleep without a call sheet. Now that the flow of the sequence is becoming second nature I can work on the shapes and the lines.
I appreciate the common-courtesy motive behind the smaller fuel tank, but I like the larger one because often enough I am able to fly mid-week at a field where I've got it all to myself, or maybe just one or 2 other guys, so I can fly the sequence a couple of times and not be a "sky hog" about it. If there are a few guys queued up to fly, I'll just do one round and out.
Concerning the exhaust flange issue, I've used the Permatex Copper stuff and still got exhaust gas seepage, as well as the gasket alone, and Permatex and a gasket combined. I have not tried the multi-layered gasket with the metallic material, nor the "Coke can gasket", so maybe those are next. Seems to me the biggest part of the problem is the very tiny amount of space between the exhaust channel and the bolt holes on the Macs header. Not much flat surface there to work with, maybe a little over 1/16" wide.