That mod is horrible for me. It makes my tenores sound hollow and just plain bad. I tried it with a much thinner piece of paper to minimize leakage and it was better, but still not good. All it does it break the seal for me instead of just lessing the bass. This causes scooped out frequencies in the mids for me too. I find the depth is more critical for me personally. Shallow is better with any tips. Perhaps if there was a much small venting amount it would be better? Or if your tenore is uber bassy maybe, but even then it would affect more than I prefer.