Dear Lee,
I totally agree with Wim advise. It is exactly what I do. I would just add that, once in Drum Setup, you have quite a few parameters to adjust the sound of the Kick: Pitch, Cutoff, Resonance and other.
In Drum setup, the Pan command too can be effective: one can try to place the Kick a little left (let's say -10) and then, in Play mode/Mixer place the Bass a little Right (let's say +10): this way the two bass frequencies sources (Kick and Bass Guitar) don't interfere too much each other.
In addition to the regular method recalled by Wim, one may also reduce the boom feeling by modifying the EQ setting for the Drum2 track: in Play mode, listen to the Kick, go to Mixer, EQ, Rhythm2, reduce the Low settings (usually about -30 makes the difference). If still not good increase the High (even to +60). Then (still playing) adjust the Volume of the Rhythm2 Track, to rebalance all.
Ciao,
Angelo
Once you like the results, save the Style with the new settings.