I'm not sure why everyone keeps getting confused by this and ignoring my whole statement.[&:]

I stated that: 10 fps gained with STS in lowest position. The other 7 fps or so is from changing out the stock string and I have chrono'd numbers to verify this.
370 gr arrow before new string and STS in lowest postion: 294
370 gr arrow with new string and no STS: 304 or so
370 gr arrow with STS in lowest position: 311

I've tried moving the STS all over the string and without STS and speed is 10 fps slower unless STS is the whole way down.