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17-18 is real low vac for it to have no leaks(not impossible, but...). I would think one of your couplers isnt clamping perfectly and under load the increase in pressure is causing the un-clamped connection to expand and allow pressure to excape.
beyond that FPR or fuel pump would be high on my list of things to check.
I would def make yourself a vac leak detector if you have access to an air compressor(specially to check things like the BOV) and figure out the fuel system situation.
PS what are you using to check A/F? are you able to read the OBD2 system or use a Dash hawk like system to data log?
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