The equalization tube was an oem feature of the exhaust design on the Mainship 34T. It was based on a water lift muffler and I don't think the the Pilot 30 has a a lift muffler. The only solution is a higher exhaust elbow. I extended mine on my Pilot 34 and it worked great. Don't know if there is room on the Pilot 30 to do the same.
How about let's communicate by email at dmfeelingroovy@ gmail.com. Send me some pics of your exhaust from down low and with the camera level. Also measure the height from the water line to the bottom of the riser elbow. Mine had 8-10" and I exteded it to 18" above water line.