lower aggregate percent lower-band to reduce variance in instance resource specs

[bwagner5]

Issue #, if available:
N/A

Description of changes:

• lower aggregate percent lower-band to reduce variance in instance resource specs

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[codecov-commenter]

Codecov Report

Merging #23 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #23   +/-   ##
=======================================
  Coverage   89.82%   89.82%           
=======================================
  Files           8        8           
  Lines         875      875           
=======================================
  Hits          786      786           
  Misses         58       58           
  Partials       31       31           

Impacted Files	Coverage Δ
pkg/selector/aggregates.go	92.45% <ø> (ø)

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[haugenj]

lower aggregate percent lower-band -> raise aggregate percent lower-band