No.Remember that Thirteen is what it is because of the planning restrictions. They were only permitted to build minimal "run off" track in the woods. Yes that section is short but the drop track and backwards helix makes up for it. Plus it's incredible in the dark!
A second loop around the trees, directly under and around the first, could have been done quite easily without the removal of any further trees in the ancient woodland.
Merlin chose to not invest the extra.
Like most rides at the Towers, including the woodie, the ride is a bit short.
And boring corner is boring...the same as the Blackpool turnarounds, built the best part of a century earlier.
Could have done more.