I know, it's a neverending story.
I use only my own discogs script where i have now 13 (!!!) different ways to search for avoiding this searching with browser and going back to Mp3Tag. And if I have to do so, I can just copy the URL in the browser and use it for search with the script. dano's script can do a similar thing, you only have to copy the discogs release ID number from the URL.
here is a link to my script, maybe you like it: /t/9226/1
That's because "(" is not interpreted as a character which marks the start ofa new word. You can add characters which mark word begins in the last line of the Case Conversion dialog which says: "Words begin from/after any of: Inserting (-_ there should give you better results.
It's the same as the sting $caps(%filename%, '('-) for format value, so can combine two lines into one by using:
Format value "ARTIST": $caps($replace(%Artist%,_, ), -'(')
$caps(%_filename%, -'(')
Format Value "TRACK": %_counter%
or $num(%_counter%,2) if you prefer leading zeros.