Tweaks for better stimulus spot selection

[tmcgrath325]

Adjusts the scoring function used for stimulus spot detection

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.55%. Comparing base (4917c9c) to head (9c5fe89).

Files with missing lines	Patch %	Lines
src/segment.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files           5        5           
  Lines         307      307           
=======================================
  Hits          278      278           
  Misses         29       29           

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