The remix tool can be used to find a better shape for this section. To use the rebuild, right click (or control-click on Mac) on one of the red segments and select "Remix" from the wheel menu. After a short delay, the remix tool should give you a list of different remixes. The remix for the problem area on this puzzle should show 30 results. You can use the arrows to move through the results. (The help bubble says "cycle through fragments", but what it means is "look at results".) When you see a result that looks good, click on the stop button. You'll need to shake and wiggle as usual to see how that remix turns out. It's usually best to shake first, then wiggle, especially if you see clashes.