Empty lines in exported file

I am producing a file using the following code:

finalOutput = 
  Transpose[{Drop[profilelength, 1]}~Join~
    Riffle[OPTIMUMTOP/100, OPTIMUMBTM/100]];
Export["results_\
output.txt", ToString[TableForm@finalOutput]];
SystemOpen["results_\
output.txt"]

Please note that TableForm[finalOutput] returns the table exactly as I want it to be!

However the code above returns a file with every second line completely empty. No data is missing it just has twice as much lines ad necessary. Is there a way to delete them? (see attached output file).

TableForm is meant to nice visual ascii output. This is why it inserts blank lines. You can delete the extra empty lines with StringReplace:

StringReplace[ToString[TableForm[{{1, 2}, {3, 4}}]], "\n\n" -> "\n"]

Works really nice! Thank you!