Hi Steven,
When you set the offset with path_offset_set, which type of offset are you applying? It sounds like you’re using type 3, the motion offset, as the extract in the script manual seems match your description. You might wish to consider sing one of the other offset types in order to acheive your required functionality. See the screenshot from the script manual below:
If you are interested, we (Olympus Technologies) have developped a weaving URCap already which encorporates multiple configurable weaving patterns, which is being released to purchase soon. If you are interested in discussing it, feel free to drop me a PM and we can talk more.