One more thought before you go to the Amish.
When you lower the shaft loops, check and see if you still need a piece of leather to extend the wrap straps from the girth.
Ask the harness man to show you how to attach the wrap straps, It is easier to see in person than to show over the internet. The wrap straps should go around the shafts twice, once in front of the shaft loops and once behind, then buckle back to the outer girth.
Here is a not so good example, I do not have wrap straps on my harness, so I used a shaft loop and just a plain piece of leather as an example. pilgrim 007.jpg