The only thing I can add to this is -- W.W.W
I know you've covered most of it cheese and I'm probably repeating what you said but this is how it was taught to me, pretty much every scenario/situation falls under the 3 W's, with practice and experience, you'll get used to it and learn so much more
What - what's important that your transmitting
Where - positions of yourself, your team mates and the enemy
Why - why are you transmitting, is it important
For communicating with all team members at once, say 'all call signs' and 'this is (your call sign) then say your message
If people learn the phonetic alphabet, you can be much better of with coded words, areas and situations