You've stated that the Tournament Scoring formula is the default formula: (log((n + 1) / r))
This formula will give values like: 6.90875477931522 (for coming in 1st in a 1000 player tournament), or 2.217225244042889 (for coming in 11th in a 100 player tournament).
The values you've listed for each tournament (79, 68, 31, 95, 60, 93, 58) can't be the Scores, because they're too large and are whole numbers (not fractions).
What are the player's Scores for each tournament? You've given a lot of information, which is *great*, but without the Scores, it's impossible to see what is happening.
On the Stats tab, press the "View" button and select "Single field view", then select "Score" as the column to view. This should give you each score, for each tournament, for each player.
Unless I'm missing something, of course ...