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a wholly unremarkable 11.93 for 100m. Only my second ever electronically timed race. I intend to kick the crap out of that time.

Did you have any reason to believe you would kick the crap out of the time?   Dont get bogged down in times at this level.

being sub 12 is always something I want to make sure of so yeah, not too bad.

I didn't expect to do much better than that although it would have been nice.
I meant that in the future I intend to beat that time by a good way. I'd be happy with mid 11s but low 11s would be better 

Don't limit yourself.   Go sub 10.  Just don't think about limits of ceilings.  Focus on the training.  Bring down your flying 30s.  Bring up your speed endurance.  Get stronger.  Whatever you weakness is just get better and let your times come down.  It won't be linear.  They may go up sometimes but they will go down overall.