Beginner TL hornresp question - is driver very close to vent ok?

Hi,
request help - I am learning hornresp to design a TL for Tectonic TEBM65C20F-8 driver. My question is although the power level looks flat, the driver position is very close to the vent, it that ok or am I doing something wrong? Please find attached few screenshots from hornresp. Thanks for your help.
 

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  • driver-parameters.JPG
    driver-parameters.JPG
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  • filling.JPG
    filling.JPG
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  • power.JPG
    power.JPG
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  • Schematic.JPG
    Schematic.JPG
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