Looks good to me.
My cure all move is to pot up in size. As you are outdoor size seems to not be a problem. I would transplant to 20 gallon pot.
think the lighter color you are seeing and concerned about is NEW GROWTH.
notice the lighter color you are concerned with is only at the growing tips.
a larger container wouldn’t hurt, especially if you plan to keep growing for at least two more months.
might also need support if the winds are an issue.
Here in the Northern Hemisphere, we are in the middle of winter. You should have maybe 3 months of full sun before the season changes.