I've found that, for each onboard style, by adding i.e:

1. Different Audio drums
2. Different grooves for each variation - started using these & it's AWESOME!!!
3. Different audio bass tracks including their AWESOME riffs for each variation
4. Different loops for each variation for channel 4
5. Different audio live guitars for each variation
6. The ability to have my live guitars change on the fly purely by the way I press my chords
7. Assigning different vocal harmonies & settings to each variation

provide more than enough AWESOME variation for me, done on the fly & then saved as a single registration that also includes the style in the registration.

One simply selects ANY style found, and this forms only the very basis of what can be created. I can take the very same style, change all the above and you will not believe for the life of you that it started off by being the same style. The same can be done for any midi only style. I hardly use any onboard style as is anymore because of the ease I can create all the above with. And I become better at this with every style I change. Best part is, that whilst using this live, I can make more changes on the fly and simply re-save the registration before playing the next song. AWESOME!!! AWESOME!!! AWESOME!!!