| No, you aren't....
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You may think you have a backbow, but unless your action is VERY high, you don't. If you DID have a backbow, all the notes in the middle of your neck would buzz to the point that you couldn't play the bass. And even with the action high, the lower notes would buzz, because the middle of the neck would be higher than the rest.
The proper setup for a bass is either with a perfectly straight neck, or with a little relief. Relief is defined as a small upbow, not a backbow. An up bow leaves a small amount of extra space in the middle of the fingerboard to compensate for the arc created by a vibrating string.
It's very difficult to see if you have a bow in the neck just using your eyes. The correct way is to hold the bass in playing position (not laying flat on its back) and use a long precision straight edge, preferably with notches cut for the frets, otherwise you are looking at fret hight, and not neck strightness.
If you really think you like a backbow, tighten your truss rod until the strings fret out in the middle of the neck. That's a backbow. No bass should have a backbow. | 
