If the long term plan is to keep Bourjos, then put him in left and give him the extra encouragement, attention, patience. . whatever it takes to get to where he's comfortable there.
If the plan is to trade him, then put him back in center to show off his skills and hope for a good offer.
I don't think it would necessarily be a mistake to move Trout to left, but it's obvious he prefers center. Whether a move to left affects his play or the ability to keep him long term, only he and (hopefully) Angel management knows. But why take the chance with an elite talent?
That's just my take; there are valid points on both sides of the issue.