I don't know if this has anything to do with it or its a coincidence. sometimes while doing different coils and such I rush things. the last couple of days I have taken my k-lite apart probably 30x's to mess with these different builds. well yesterday I did a double vertical with a different diameter then usual. this coil was sloppy and the leads from the coil were impeding close to the air holes before reaching the screws. I mean the turns of the coil were fine, it was the bit of wire after the last turns of the coil on both sides that were sloppy. these leads before the screws and after the last turns of the coil were in the path of the air hole. I think this made some difference in the performance. usually I attach the wire leads to the screws directly in the shortest path from the last turn of the coil. these leads are away from the air hole, and in these coils I have the best performance. I have done coils in the past where these leads aren't so clean and part of the wire leads are sort of in the path of the air flow. like I said it could of just been a sloppy coil but it is possible that a better performing coil is one where there is no wire leads close to the air hole under the coil.