as title: when you pick the PL 9 ability Empowered Strikes on a Monk and use (empowered) Whispers of the Wind nothing special will happen. No +100 PEN and no +100 ACC. Nor on the first attack neither the following. If I use Stunning Surge (for example) it works.
In addition, the other "Empower-Abilites" (+1 PEN, +10 ACC and so on) that you can take at PL 7 also do nothing with Whispers of the Wind.
Find a Monk (MC) with those abilities here in my savegame and try it out: