Personally I would completely lose that baileys dump valve and reatore the oem location and install a Forge 007/008P. If your already re-mapped id also use the yellow spring if stage 1.
You already have silicone boost hoses, and the ones you have fitted are from creation motorsports I used to have the same ones on my 1.8t when I owned it.
The air leak you are hearing is ether most likely where the previous owner has attempted to blank off the old DV locations and it has failed, or the TIP (turbo inlet pipe, the big blue one on the airbox) the bottom of that pipe connects directly to the turbo, it may have come slightly lose and not be seated correctly (this happened to mine)
Personally I would restore how it is meant to be setup.
As for the fuel smell, this also happened to mine but i found that my fuel line (near the coolant bottle) had a slight split in it.