The spring is too strong on my channel balance

I have pictures of the type balance I need but the spring is too strong. The window weights 30 pounds. The Id marking is 29 9 KW CMC 11 and the length is 30 inches. Can you suggest a replacement. I think the repair man used what ever balances he had on the truck. I have replaced many top sash guides that were damaged because the spring is too strong.

As to your question 15-005 is the correct bottom.
It is 1" wide with wings.
Earl

I just put in two S385-30 channel balances. They appear to work fine but the spring is noisey when shutting the window. Did I miss something or is that common for replacements.
Earl

Can you show me where the hole should be. There are two holes located where the hook goes and I have the hook located in the bottom hole.
Earl

After asking about the spring noise and receiving your comment about drilling a hole. I remembered there were two holes in the jamb and I had the balances in the lower hole. I moved them to the upper hole and now they make very little noise and work fine.

The ability to obtain advise on selecting and installing your products is invaluable. Later I will replace the rollers on my sliding glass door. Guess where I will order my parts from? Thanks, Paul.