Channel Balance for 30.9 pound sash

A quick learner from San Jose, CA says:
I need some clarification on which channel balance to order.
I have a 1/2 wide model. 26" Length
Per your website top guide is 19-005, bottom is 15-004. All Very Clear.
The issue is specifying the weight range.
My Window is 30.9 lbs. which is above the 28 lb weight range listed as a selectable option in your menu.
The Stamping on the two previous channel balances I have used are (Note: this will be the third set)
First Pair - 25DS (ND) 40 BSI
Second Pair - 2565 BSI (FA)

Note: Items in () are smaller font than the rest of the stamped text.

Recommendations on which unit I should specify?
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Tom from SWISCO responded:
We can custom make this balance using a 2565 option. Two S385-26 balances with this option can carry a sash weight of 30 through 33 pounds. If you want me to do that, just let me know how many you need. Thanks!
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