Most songs don't need filling out that much. I play a precision mostly, and never scoop the sound - which does help.
On some songs I play the rhythm guitar riff rather than the bass line (e.g. Witch Queen by Redbone), roll off the treble and play up near the neck to let the guitar really take centre stage (Black Magic Woman by Peter Green/Santana), wind up the overdrive to create a wall of sound behind the guitar (All Along The Watchtower by Hendrix), or occasionally play 5th chords where it definitely needs filling out (a couple of accents in Whiskey In The Jar by Thin Lizzy).
Mostly, just be in balance with the guitar and don't be a shrinking violet