Tools mentioned is for form field object alignment (field itself).
Is any line break, or carrige return in the first line inside of text field?
For text alignment, multi-line, Alignment = left should work to start text from top left corner inside of a text field.
Small amount of space can be seen, depend on font, and font size choosed.
Also, if Text filed has "Allow Rich Text Formatting" option on, and text is copied and pasted from somewhere with RTF attribute that looks taller text?