Ive been using orchid v4's and absolutely love them but bought a v6 and built it and the airflow on the v6 has drastically been reduced. The v4 hits like a dream. I noticed they put raised airflow holes under the coil. Can these be drilled out to increase airflow? Can I also drill the air holes on the side bigger? If so what size drill bit should I use? What are the 2 holes on the bottom of the base next to the 510 connector for? Hopefully someone can help me here. Thanks