Filename Issue and Conversion

Any help getting this to format properly would be greatly appreciated.

The filename(s) in the folder contain the artist wrapped in brackets (as shown). I'd prefer it simply show....

Pat Benatar - Heartbreaker

As it is, it will not allow this and it will only show .flac when using the string %artist% - %title%.

If you want to use data from the tags, it would be necessary to have data in the fields.
Looking at your screendump I only see the filename.
First, fill the tag fields with Convert>Filename-Tag
Format string: %track% %title% (%artist%)

Then try your approach again.