Yes and yes. It's easy to see if your wing is balanced. Turn it upside down and prop it up on something. I added some stripes to my lighter side to balance it out.

Unequal washout will affect how the wing flys. It would be like flying with one aileron higher or lower than the other (although the BLT doesn't have them, but you know what I mean). And the farther out on the wing the deflection is, the more effect it will have--just like a lever.

Checking the washout is easy. Put the wing on a flat surface (I use a glass table). Put one wing flat on the table and measure how much washout you have as well as how the washout 'washes out' down to the root. Check the other wing and correct as the manual suggests.

Is your vertical fin glued parallel to the fuse as you look down the fuse from the nose (stand back at least 6 feet when you do this)? And the wing 'parallel' to the horizontal stab when the wing is on?

Good nose mod. If I crash again, I may just do that. A nose in will likely mean a pylon repair though. Best not to crash at all!

I see your landing gear is mounted as the instructions say. Watch to make sure that the landing gear doesn't cut into the pylon so your landing gear points backwards. Mine did exactly that so I remounted them forward about an inch, angled them forward about 15 degrees and used some popsicle sticks to brace them.

The BLT is a good flyer though. Will handle a bit of wind too.