Pax,
I'm glad you like the grav. tech tree
It's good to know that somebody is using it. I personally thought that the slower the missile, the more PDF fire it would take... so the obvious method to increase missile value was to make 'em faster!
I have to admit that I haven't really tried out the bombardment missiles yet - they looked to massive to be worthwhile. Have you found them to be significantly useful (i.e. how does it compare vs 2x normal missiles; how do the normal and bombardment missiles compare when using the grav. tech tree)?
cheers,
jimbob