official 1/4 mile track times
^ For your reference.
Your time isn't out of the range of predictable outcomes.
Some notes:
-1200 RPM launch seems a bit low for an engine with a decided lack of torque. But the 7AT folks would know better than myself.
-Tires: Conti DWS 06 aren't an awful tire, but you're definitely going to lose some performance versus summer rubber (less relevant here but they have the sidewall stiffness of microwaved butter).
-Temps of 90° (and assuming higher on-track temps) will likely rob the engine of a bit of top-end ponies vs say making the same run in early spring.
-Mods: 50lb extra of sub/amp won't help you shave any time off your runs obviously, but it probably didn't add much time on either. Also, your axleback won't really add any power, but I bet it sounded nice to the spectators hearing you rip down the track
