Dude, I've got no real idea about fuelling! You said your guy said the fuelling was ok
But I'll give you my opinion even tho I might get slated! I think from what I've read, is that 11.3:1 is ideal for on boost, I think Hans said something similar. You've got a min of 11.2:1.
Why it's a bit wavy , or whether it's supposed to be like that, I don't really know, but it looks like you're not leaning out and or going too rich either, so your SEB must be real
I think mjjgt put up a pic of his fuel ratio graph, I'll see if I can find a link...
The evil elbow and down pipe are def worth having. Probably the same with the cam, but I'd like to see you run low boost on the tts1 for a longer power band ideally