Doing a mix with stems, The stereo drum track sounds good except the hat's are hot, they are panned more to the right.
 
So far I've only tried a low pass filter, but by the time I tame the hats the other cymbles are dull..
 
 

Consider re-importing the drum stem as two mono tracks. Then use EQ just on the right. Try a high shelf cut also.

Ok, that's a good idea. 

One other thing you could try is clone two more mono tracks from the above suggestion, and severely mid to high shelf cut the clones, and then mix the four tracks together until you have a good balance between the four tracks. A way of cutting the highs by how much you mix back in giving you more control.

I often use notch filtering in similar circumstances if I can "tune in" on the hats without affecting the highs above the notch.

Do you have R-Mix from X2? This might be able to isolate the hats.
 
If not, multiband compression is also sometimes a good alternative to straight up EQ-ing as it will leave some of the highs intact.

you can try Mid or side EQ techniques, if the hats are in the center or panned to the sides. Other than that, you will degrade the sound quality of the entire drum track when using EQ to try and tame the hats as it will effect the overall sound of the drums.
 
Re-record it and remix it. Having drums on a single track isn't a good idea. anyways.
 
CJ

You can try Mid or side EQ techniques, if the hats are in the center or panned to the sides. Other than that, you will degrade the sound quality of the entire drum track when using EQ to try and tame the hats as it will effect the overall sound of the drums.
 
Re-record it and remix it. Having drums on a single track isn't a good idea. anyways.
 
CJ

Another thing to try, grab a dynamic EQ (Melda has some good ones). It will let you select an frequency range and only compress it when it exceeds a threshold. It's kinda like a super flexible multi-band compressor. 
 
Dean

Might be worth playing around with a multiband compressor?  I realize that you might also catch some crash cymbals and such in the process, but depending on the material, you might be able to use the compressor attack for the EQ band in question to only catch the really percussive stuff as opposed to the more "washy" stuff.
 
Does that help at all?