Sorry for all the posts - there is a LOT to wade through.
OK - this may be what you are looking for.
I am using the Scarbee Pre-Bass Amped instrument, from Kontakt 5 for this.
1. Load the instrument preset into the Kontakt Multi-Rack. I used preset 'Scarbee Pre-Bass - Amped - Fat.nki'.
2. Click the wrench icon to get into editing/settings mode.
3. You should see a gray area appear. At the upper left of this gray area, look for the word 'Source'. Just under that it will say Preset (with a drop-down arrow), and just under that, it should say 'Mod'.
4. Click on that button that is labelled 'Mod', and it should open up the modulators that are in effect for this instrument. The one I see is set for Pitch Bend. To the right of where you see 'Pitch Bend' is a slider, and this slider is set to control the RANGE of pitch bends for this instrument. The default is set to 2 semitones. Adjust this slider to set the pitch bend range the way you want it.
The above should do it for you.
Please let me know if this works for you, or if you have trouble,
Bob Bone