I'm still blown away by your exceptionally low weight. Mine uses 8S3P, a Hacker C50 10XL and as you said, it weighs about 9.5 lbs. But this power system will have just shy of 1500 watts at the prop. If it ends up flying heavier than I'd like I might give your power system a try.

One thing is for sure, you have one of the cheapest electric pattern planes out there for it's size.

Wiz