http://i.imgur.com/ghBo4P6.jpg
http://i.imgur.com/w0XPzdQ.jpg
You can S-rank this in under 20 minutes with the following AIS distribution:
Wave 1: 0
Wave 2: 1
Wave 3: 1
Wave 4: 1
Wave 5: 1
Wave 6: 3
Wave 7: 5
Wave 8: 12
With two people assigned to collecting crystals you should reach 7000 just in time for Wave 8 without any stalling tactics.
IMO people using AIS should prioritize their targets:
Enemies (boss or otherwise) directly attacking the towers > Infection towers > VTOLs > Walls > Bosses not attacking towers > Mobs not attacking towers
Although that's really up to the individual, and even though mobs not attacking towers are low priority often it speeds up rounds greatly if you use the photon blaster (sub-pallet laser) on large swarms of Goldrahdas at the end of waves.
More notes - people have figured out it's possible to damage enemies before they spawn (like the spawn kill trick in Naberius TA2), so researching that further might be necessary for 3 runs. Also Zanverse apparently works with AIS attacks, so if you use it with the photon blaster you can kill bosses in seconds. Haven't tested that out myself though.
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