Don't worry about it, DH. After some discussion (and me finally tracking down the rules in the Basic book), it would seem that the drone control/sensor rating is almost always 6, the number of sensor boxes on the ssd is for damage allocation (hull boxes I guess).
Although, changing the drone control ratings to equal the number of sensor boxes (but of course keeping the double rating were applicable) would lower the control on many drone carrying ships, giving a little more parity (slight, but there) to the plasma races in mission times...but that's not a flame war I'm willing to start, lol.