I use a parametric eq to do that:
Parametric:
LoFreq 20Hz
LowQ 0.1
LoGain +6dB
MdFreq 2.1kHz
MidQ 1.4
MdGain +5.5dB
HiFreq 3.7kHz
High Q 1.0
HiFain -6.0dB
Level +3.0dB
The HiFreq is at 3.7kHz because that's my Strat bridge pickup's resonance frequency (found by ear).
Humbucker resonance frequencies are typically around 2kHz. Use MdFreq to adjust to taste.
The LoFreq with low Q=0.1 (very wide) adds fatness and the level adds gain.
Try it and report back it it does the trick for you!