Increase backoff coefficients to wait more between attempts

[benoit74]

Current settings where trying too often, let's wait more time between attempts, we are not in a hurry.

Exponential wait time formula is factor * base ** n where n is trial attempt number

Default setting: factor=1, base=2 => 1, 2, 4, 8, 16 ...
New settings: factor=2, base=3 => 2, 6, 18 ...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.76%. Comparing base (21527da) to head (7119f72).

Additional details and impacted files

@@                 Coverage Diff                  @@
##           table_of_content     #106      +/-   ##
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+ Coverage             43.71%   43.76%   +0.04%     
====================================================
  Files                    20       20              
  Lines                  1153     1154       +1     
  Branches                165      165              
====================================================
+ Hits                    504      505       +1     
  Misses                  637      637              
  Partials                 12       12              

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