Interesting. I never considered this with my set up. I am getting boost reference after the throttle body.Drill and tap the turbo compressor housing above where the discharge tubing connects. I am pretty sure that putting it after the bov will cause problems.
If you find links at your silicone couplers spray them with $1 hair spray before assembling. When it dries it seals the silicone to the steel piping and prevents leaks.
If you have to take the coupling off the hair spray cleans off with water.
Interesting. I may need to check this outYou might also have a leak at your bov. Check it out to make sure it is operating correctly. You can make a boost leak checker with some pvc piping/fittings from home depot and a metal tire stem (any tire shop). Search youtube.