slim down some of the TESTSUITE_NPROCS cases (for speed)

[jlnav]

Without necessarily dropping coverage...?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.04%. Comparing base (8c47657) to head (42eaff6).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@ Coverage Diff @@## develop #1762 +/- ##
========================================
Coverage 77.04% 77.04% ========================================
Files 79 79 Lines 8325 8325 Branches 1282 1282 ========================================
Hits 6414 6414 Misses 1666 1666 Partials 245 245 

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