So what is the current output? What would you like the output to be? What does DetermineFontSize return? 
sub DetermineFontSize ($) {
  my ($tagCnt) = @_;
  my $cntRatio;
  if ($useLogCurve) {
      $cntRatio = (log($tagCnt) - $minLog)/$logRange;
  }
    my $fsize = $minFontSize + $fontRange * $cntRatio;
  return $fsize;
}

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So what do you expect to happen if $useLogCurve isn't set? Currently the sub will always return $minFontSize in that case (and emit a warning that $cntRatio is uninitialized).

In reply to Re: Setting up a log to determine font size by moritz
in thread Setting up a log to determine font size by Quicksilver

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