The stun on shoulder tackle is not in an incredibly usable state. The best use I've found is to interrupt Terror Eye on the adds during the last fight in AK. Otherwise you have to be a long distance away to use it.

However, Shoulder tackle has a great use in giving monk in combat mobility. Such as on hardmode garuda, getting back to garuda after plumes to continue keeping up GLIII and continuing to dps her. HOWEVER, on fights like ifirit and many other endgame fights where the tank/off tank has to interrupt the boss, you mine as well take shoulder tackle off the bar. Because you will add to the diminishing returns of the ability.

What I propose:
-Remove the stun from shoulder tackle.
-Remove the need to be distant from the target to use.
-Greatly lower its cooldown.

It becomes completely a mobility skill for moving about the battle ground.
With no range attacks and the need to continously attack to maintain their GL, this would add an interesting dynamic to monk.