Regarding upgrading the defense layout

In my current defense layout, the marked tower gets destroyed very easily. I have seen similar layout in the past, and the tower at this location dont get destroyed in those layouts. Please help.

What is the level of that tower? Appropriately leveled and enhanced towers are roughly 110-120k hp. A blessed tower goes as far as 150k+

Besides, try with different rotations for the tower. Rotating the tower slightly changes its placement, and thus potentially trebuchet-reachability…