'how can we use airpower in a better way against insurgents?'
I think part of the problem is not how we actually use airpower, but the perception of air power that the lords and masters and Army high paid help have of it.
The perception amongst many in the 'stan was that a CH-47 was nothing more than a flying 4-tonne truck - and that from the same organisation that labelled us utterly utterly useless.
Educate the people that use airpower and benefit from airpower and I think you will see a lot of the (alleged) problems currently associated with airpower will disappear. That said, CO 3 Para was an absolute star in that respect and totally understood air power and what exactly it would mean if we lost just one of the flying 4 tonne trucks .... if we only had more with his level of understanding in the higher reaches of the army food chain.