LaTeX.org

Yes.
The line that causes the extra space at the left is this one:

[ldd][ldl(0.5)]!{\sbendh[0.5]@(0)}

Simplify it to become:

[d(2.5)ll] !{\sbendh[0.5]@(0)}

The reason is a subtlety that occurs when you use a factor to move to a new position,
when that factor has a value less than 1;
e.g. [l ...

Easy:

Using an "=" sign for the break is not really the best, as it relies on the font character, including its height, depth width, and thickness of its line strokes.
viz.
http://maths.mq.edu.au/~ross/images/break-equals.png
Notice the gap below, and how it is wider and clunkier than other elements in ...