Uh Yeah.......as I say on my website, they are optimized for weight and the E-6 thrust curve, and to be easy to build, if I make them stiffer and heavier and they won't glide as well or boost as high on the E-6, the E-6 gets a higher altitude due to less drag at lower speeds and the recent E-15's now are closer to a 34ns motor instead of a 37.5ns E6. If this was a new E-15PW, they are actually E-20PW's now that are still being labeled as E-15PW and have a 8# peak thrust instead of a 2.7# peak. It's much harder to steer a high thrust motor as well especially in the wind, or without wings
But at least you have video proof for others and you seem to be taking it pretty well
If you get a rtf weight closer to 14-15 oz the E-20/E-15 is probably ok, most of my kits are in the 10.5 to 11.5 oz rtf weight.
Thomas if you don't mind I'd like to share that video on my site as an example to those who feel the need to abuse these poor airplanes that have never harmed anyone
Just so you don't feel bad, here is my best flutter example of an overweight upscale of the Mach 10 that came out so heavy I had to use a G-40 instead of a G-12, it's impressive the wing TE got to about 90 degrees to the line of flight before it failed...This model was 8" diameter and 5' wingspan at around 40 oz rtf. For reference that is a 7' long rail it is launching off of.
[video=youtube;mOhngbhZDWI]https://www.youtube.com/watch?v=mOhngbhZDWI[/video]
Frank