I thought I'd give everyone an update. I flew the bugatti on the 800mAh 3s battery today, and it flew so much faster. I'm very happy with how this plane turned out: very fast, very nimble, very responsive.
One thing that caught me off guard the plane rolling right. I had to trim my ailerons to the left 50 clicks before it leveled off. The plane does not have any significant balance issues (weight-wise) about the roll axis. I've always had to put some left trim, but with the new motor/battery combo, I definitely needed to add more. My motor spins the typical direction- I wonder what is causing this.