Take pictures of what you broke, and I'll try to help you source new stuff.
It sounds to me like you tried to rush this. Take your time, slow down. It's ok to take a few hours and do something right. Keep track of all your pieces, etc.
You only need the app connected while changing settings or recording logs.
You've also probably placed the Bluetooth module in a sub-par location where something is interfering with it. I've never had an issue with that before.
Also: If you're running anything more than Map 2 on pump gas (no...
There are a few things, but nothing as impactful as the head. The tune would be second most impactful. You would see some top-end (as expected from the additional ports) from the head swap.