Test Parallelization Timings don't seem to work

Build Environment Running Tests
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I am trying to use CircleCI’s test parallelization outlined here: https://circleci.com/docs/2.0/parallelism-faster-jobs/ but I can’t seem to get any improvements. The timing data looks like:

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And I am running an rspec test step of:

        - run: bundle exec parallel_test --type rspec --first-is-1 -n 2 $(circleci tests glob "spec/**/*_spec.rb" | circleci tests split --split-by=timings --timings-type=filename)
        # Save test results for timing analysis
        - store_test_results:
            path: test-results

I would expect over subsequent runs of the same job that the timings would have smaller and smaller amounts of variance where container 0 could run less tests and container 3 could run more, for example.

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