Let's say I'm editing a latex in Auctex's latex-mode, and I have the following equation.  
**This is just indented with `indent-region`.**

    \begin{align}
        \phi & = a + b
        + c + d \\
        & = a + b
        + c + d + e
    \end{align}

The above alignment is what I get if I select everything and hit `TAB`,
that is, if I'm just using `indent-region`.

**What I would like to get is the following:**  
Note how the `+ c + d` is aligned with the text *after* the &. This would make the most sense to be, as the `+ c + d` are part of the same "column" as `= a + b`.

    \begin{align}
        \phi & = a + b
               + c + d \\
             & = a + b
               + c + d + e
    \end{align}

**Below is what I get if I call `align-current`.**

    \begin{align}
        \phi & = a + b
        + c + d \\
             & = a + b
             + c + d + e
    \end{align}

Which *almost* gets there, but not quite. The difference is clear.  
Also, if I decide to remove the `\phi`, `align-current` does something simply bizarre:

    \begin{align}
     & = a + b
        + c + d \\
     & = a + b
             + c + d + e
    \end{align}

**Is there a way I can customize `align-current` or use something else to get the desired effect?**