I don't recall the thread.

However, ideally you want to rod and reel to balance at the point where your index finger curls under the cork when you grip the rod. This is with rod strung about and a normal casts worth of line hanging from the rod tip.

Many people seem to prefer to have the reel end slightly heavier, so that holding the rod in a tip up manner (as you typically would during a drift) is more natural.

My personal opinion is that perfect balance isn't too important. If I'm way out of balance -- eg, with a oversized, heavy reel on a very light rod or with a light reel on a very long (10') rod -- it's bothersome and I would change reels. But if it's reasonable close, it's not worth worrying about for me and certainly not worth adding weight to the reel or rod butt (as some folks like to do).