Manual Boost Controller to Wastegate

[forte500]

I am hooking up a manual boost controller (Turbo Xs) to wastegate and notice the diameter of the wastegate and intercooler nipple is larger than MBC nipples (4mm)....while I can stretch a vacuum line over the larger nipples, I want to minimize potential spiking....anybody encounter this before?

ps. I already drilled-out the tiny orifice on the MBC nipples to allow more airflow, which significantly reduced spiking.