Please confirm channel balance part

Thanks for writing in. Yes, nice work--I agree with your analysis. The only other thing I'd point out is to be absolutely certain the depth of the bottom nylon shoe is greater than 1". If the bottom nylon shoe was only 1" deep, then you'd need the S380-27 instead. Otherwise, you're totally right that the S385-27 is what you need. It certainly looks that way from your photos, but pictures of a ruler aren't always the best to go by, so please double-check to be safe. Refer to the image below to confirm the depth. 

You are also correct that you'll want to choose a stamp option of 2640 (19 through 26 pounds). Let me know if you have any further questions. 

Comparison of the S380 and S385 balance shoes.