Pat buddy guitar weight and sounding better is going to be a very subjective topic just like about half the current threads running at the moment......
But I am a fan of light weight, stiff guitars and I'll stick my neck out only far enough to claim that it's a personal preference for me.
I went on a campaign about 10 guitars ago to be mindful of the weight of my building style and materials. Since then the guitars that I have produced sound better to me then the heavier ones. Many others who have played my stuff side by side have agreed that my lighter weight guitars sound better - no one has preferred my heavier guitars. But this is not science.
Remember too that I am the guy who decided to build 10 guitars first before ever seriously considering selling them. At 10 I decided that I had better build 10 more...... So many things have changed in my building style all along the way not just the mindfulness of the weight of the thing.
But I do believe though that for every guitar made out of any specific materials that there is going to be a weight that is more complimentary to the guitar ringing like crazy and a weight that will slug it out...... Can I prove it - No.
RC airplanes, jets, and helicopters - absolutely yes to all of the above. That was what sucked all my money 15 years ago.......
Toward the end helicopters were my bag and I was doing some 3D aerobatics and performing at air shows. An accomplished commercial and military pilot friend of mine and I built one of the first flyable RC jets with an actual mini turbine engine. The engine was from France and cost us over a couple K if I recall correctly...... The jet modeled after an F-18 was a nightmare to fly with actual, not scale speeds exceeding 200 mph and it was very difficult to see.Fortunately I have not crashed a guitar yet.......
I would suspect that there are a number of us here who either did at one time or currently engage in RC flying.