Looking forward to joining you. Just placed my order for a Bix V1.1 ARF during the wee hours this morning, from the time they announced their arrival until they sold out. Still a few kits left last time I checked. Now just waiting on the post office.
I'm assuming you have the carbon rod in the wing, right? Run a strip of clear packaging tape from the root out toward the tips top and bottom. That will add some stiffness.
I really don't worry about the wing flex. I've pushed it beyond its limit, once. Both wings ripped out and the fuselage lawn darted. Pretty hilarious. Damage was minimal. Don't be afraid to fly the heck out of it!