Mr. Yeager, Ms. Ride, et al, all did the things they did carefully, with a very distinct and well thought out plan, and engineering to back them up.
As to the Gross Weight waiver I operated under, and that 10 % thing you keep referring to, the part you fail to recognize is that utilization of that waiver required and dictated very specific and restrictive OPERATING LIMITATIONS, over and above what the manufacturer specified. THAT is not "just a paperwork" excersize, and as I noted, I never felt good about operating the airplanes at those weights.
As to my experience, yes, I spent many years moving stuff around in the back country, all kinds of stuff, and mostly off airport. I carried a simple SCALE to weigh the stuff that was going in the back, any time there was a question. Boy, that's a tough one to come up with.....
But, let me throw this out for you, oh highly experienced Alaskan aviator type: Go out and actually WATCH real no joke back country operators who've been around for a long time, and who are working tough and tight places. Those guys almost NEVER operate their airplanes in those kinds of places even close to gross weight, let alone OVER gross weight. You don't achieve reasonable bush performance with a heavy airplane, ANY heavy airplane. I've watched a number of guides taking in sheep hunters, with fuel cached in barrels close to the sheep camp, but on a big strip. Then, the Cub goes into the sheep strip with a client, a LITTLE bit of gear, and 6 or 7 gallons of gas, a 15 minute or so trip. Nobody operates heavy in this kind of environment.
What you're doing isn't flight test---not even close. All those people you mentioned at the beginning of your post would NEVER operate in a completely experimental category such as you describe, with no backups and no oversight and engineering input.
And, let's see: 50 pounds over in a 150 would be, what?? About 3 or 4 % over. Sound familiar?
Hope your hunting goes well, and that you don't appear in the NTSB database.
MTV