Newbie here in Ontario.We renovating and due to new kitchen cabinets, we had to redo the plumbing under the sink. The venting stack is about 2 to 3 feet from sink drain. With the faucet fully open the sink slowly fills up and bubbles start coming up as it drains. We thought it was leaves in the vent stack on the roof. So flushed that with a garden hose. We noticed that when the garden hose is running in the vent stack, we do not have the bubbles in the sink. That seems to indicate that it is a venting issue. Seems like the "current" from the water coming down the venting stack is dragging the water from the sink with it. I guess the vent has a lower pressure with garden hose running in it??? Looking at the P-trap, I think that the right side should have been higher by an inch or two. Btw, we are using 1.5" and. Will this fix the issue I am having? I have included a picture showing the current configuration.