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I may be wrong but it seems to me that it wouldn’t matter where on the flow perimeter the injector squirts from.
 

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The bump might be there to add turbulence near the injector to improve air/fuel mixing or to push the airflow towards the offset injector to improve air/fuel mixing.

The injector offset may be to better aim the spray of fuel in the direction that the air flows through head. The ports in the head aren't a straight shot to the valve/cylinder, they each bend right or left towards the valve.
My comment wasn’t clear. If you were to look at a round runner head on I don’t think it would matter what degree of the circle the injector fires from.
 
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