You need more run time to determine if you are actually running leaner than normal. Make sure you calibrated your AFR gauge per the instructions and that it is sitting flat and tight. Sometimes those copper washers get wedged weird when tightening the sensor down.
Google AUS Injection and just give them a call if you want to send out your injectors for cleaning. They are very nice people.
On many of the vacuum lines, you are better off using zip ties than worm clamps. Worm clamps often get over tightened and eat away at the rubber that can cause small leaks.
From experience, bolts love to get caught in the below places...
On the passenger side between the frame and coolant hard line.
On the drivers side underneath the intake manifold down by the starter and power steering assist box.
Above the plastic shield that sits on the bottom side of the intercooler and radiator.
Air is your friend. Jack up the front left side really high and take a air gun and blow around like crazy.