Coverage DOES matter. I disagree. The difference between 8 inches and 9.5 inches is 18.75% more coverage on every sweep. It might not make any difference on target separation (because turning it sideways, you're actually only getting a .5" difference in coil width on a DD.), but it WILL make a difference on amount of ground covered.
And more ground covered, means more targets encountered. Personally, I'd take the .5" coil width hit in target separation (which is likely to be non-noticed), for a nearly 20% gain in sweep coverage.
But then again, I'm running the NEL Thunder, sweep coverage for me is what it's all about!
Skippy