Interesting test, and worthwhile evidence, but I think you're getting way ahead of yourself to say anything is validated. The fact that you got some trials unstable and one that spun seems to support your hypothesis, but is a long way from confirming it.
The next steps would be to run several (many) more trials with similar designs and to devise other experiments that may provide evidence either supporting or refuting the hypothesis. Of course, the best thing would be to put such an object into a wind tunnel with smoke trails to show what happens around the "fins".
I've seen a couple three LEMs launched at club launches. Never seen one that didn't tumble violently the moment it cleared the rod. I wouldn't even call them skywriters, as they didn't gain enough altitude to qualify.