I’ll take that as a compliment, but don’t tell everyone about the size of the tool 
You don’t say what you’ve been changing the MAC address to for the other devices, but In this post, there’s an interesting comment…
It says to only change the last two digits of the MAC address. I have no idea why that should be the case, unless it’s a limitation of the library, but might be worth taking note of.
If you’re still having problems then maybe go back to the standard way of declaring the MAC and IP addresses, at least for testing purposes?
Pete.