Monk Identity and Blitz ?

[Shurrikhan]

A fair concern... I had to think for several minutes, to think through a good response.
My answer to that would be my re-design of Greased Lightning stacks, which would replace the current Greased Lightning traits... the concept fixes the Greased Lightning stacks old duration issue, also makes the upkeep and maintenance of Greased Lightning stacks both more demanding and interactive than Storm's eye, DarkSide, or Huton; and even makes if the Monk fails that upkeep, less of a harsh loss...
While.. since the only way to gain Greased Lightning stacks, is to go through the normal combos and do proper form-to-form shifts, this would make the standard rotation and normal combos important and relevant, so I hope that it would resolve your issue and ease the concern.

If you want, I can post my re-design concept of the Greased Lightning stacks, for you to examine and evaluate.

Though it'd come at risk of someone telling you that any and every possible iteration of GL is a concept beyond redemption, sure, feel free to share.