Hi,
I'm gonna give another possible solution. Well, try anyway 8) I have the CS set, but have never tried the Painkillers. But based on the clips and what I've read, they have more mids when compared to Cold Sweats, a similar(ish) bottom. My view is that a big part of their tightness is the ceramic magnet AND the fact that they push a lot of mids, the mids get more distorted than the bass.
Here it comes. If you really like the Cold Sweats for many applications, BUT need more tightness for certain applications, consider an overdrive pedal such as a tube screamer. This will boost the mids, cut the lows a little and up the output. Very generally speaking, make the output and frequency response closer to the painkillers. But it probably won't boost the low mids, which you said you didn't like.
My 0.02 dollaaaas
-Zaned