I have 4 one inch intakes and only use all 4 to get the thing started. After the temp hits about 180 I shut down 2 of them and leave the other 2 open til it hits 220 then go to 2 about half open. My charcoal seems to burn evenly enough. So with 6 intakes and your wanting to get an even burn you will be adjusting all 6 intakes, all of them open 1/8 or so. Seems like more trouble then its worth. But reinvent the wheel if you must.
Drumhead - UDS x 2 & UDG
Keep on Smokin'
KC native missin' KC
IMBAS Certified MOINK Baller 2009
I also support PETA - People Eating Tasty Animals