Does BS have a different delay when in a macro?

Someone on Basil posted that he put B-Step in a macro on its own (so just 1 cast of BS in the macro) because it shortens the delay between BS and another different skill, such as Assaulter.

Is this true? I've tried it out and I honestly can't tell if there's a difference.

Also, does anyone know why BS keeps casting itself? I just tap the macro and BS casts as usual, then even without me tapping, it casts again automatically. I've only got one BS on the macro.