It's bracketed by power not level, the recommended ones are also usually NOT the best you can do. Go into the full list and find the highest power requirement you qualify for and do that one.
32k and 35200 have plenty of gold, 37600 have nothing but gold, 43200 have the mystic reds.

I don't really know anything below 32k, I'm doing 37600 and the list is not complete so.... But in any case, if you aren't getting better reward than what you were getting, then chances are you are doing something wrong (going with the crappy recommendation) or is weak for your level (in power, thus not qualify for better TI), both of which is YOUR problem.