Aloha S,
Try rolling off some bottom end on those ‘pie-annys’. 
As roel posted, around 400 Hz is a good place to start.
And try your mix on as many diff systems as possible.
Tip:
Be delicate. Go slow. Gently ‘carve out’ the offending frequencies.
The 30 band parametric eq unit built into Cubase (GEQ-30) is a good tool for this.
Good Luck!
{‘-’}