The good news is...

...that un-commanded roll issue is gone on the Trex 500fbl (HK).

The bad news is I didn't fly it very well.

c

I think the gyro gain was a bit off... She's got the BeastX FBL system. She flew ok, but was a bit mushy holding her head, and I was so scared the whole time I was behind her the entire flight. I lost control and she grounded hard. But now that I've secured the gyro that funky death roll on reaching headspeed is gone,

I've already got her back together but for a control rod, on its way from AMainhobbies. And I'll try again with more than 35%.