Spiral balance with extended spiral

A quick learner from Farmersville, TX says:
My window came with 3/8 diameter x 28 long tubes. No color, but window checks 12 1/2 pounds on a scale. In order to remove old balance I had to bend it to get it out. This also meant I couldn't put a 28" back in. I called another window parts company and was told to use a 26" and lower top mount 2". I ordered balances and installed them. They worked twice and then the spiral came out. When I called them he said I Probably needed a 26" extended spiral. He didn't have them, refunded my money, and gave me your name. It looks like I need S306-26 extended with a 15-066 clip. Can you help me? PS with window closed I have 26 3/4 at the top. Open 26" at the bottom.
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Tom from SWISCO responded:

Thanks for posting! I can see where your original supplier was coming from. We often have to do that ourselves and find it works well. If you need the extended spiral, then our S306-26 is indeed the part in question. The length of the inside spiral rod is 28" long. Check the 26" balance that broke just to be sure it's not the same; if it's the standard spiral rod then it will be only 27" long. 

Let me know what you come up with. If the S306-26 won't work we can try to work out another solution.

A quick learner from Farmersville, TX says:
The inside spiral on the the broken one is 27" long.
Will the S306-26 have the 28" spiral or do I need a different part number?
Thumbnail of the uploaded file named AA224A7F-22D1-47DB-A83A-9398FD5E28D2.jpeg
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Tom from SWISCO responded:

Aha, I knew it! The S306-26 has a 28" long spiral, yes. My hope, then, is that the extra inch will give you the clearance you need to get those windows to close.

A quick learner from Farmersville, TX says:
Last question. I dropped the original mounting point 2" to install the 26" per dealers instructions. Do I need to to raise it back to original point or leave it at the new location?
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Tom from SWISCO responded:

Well the first 26" balance you tried first fell short, right? Since you have an extra inch to play with I would keep it where it is now and see if it works. If you raise the balance back up then it would likely only fall short again.

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