Oh and still on the planet thingie. I'm not quite sure how the mechanics of it work, but taking out planets with 11k people is a bit hard, I basically will empty up a planet to get the army for it ^^
Also you said you don't usually get that far in the tech tree (to get Nano Ripper). My goal was to develop high tech weapons as fast as possible so I just build up a few mass driver ships for each planet to defend (and few to take out one of the opponents smaller colonies) and after that went on HEAVY research, researching the weapons and large hulls. Then some defence and after my first large vessel was ready, it could pretty much hold it's ground on a single planet against a few fleets. I don't think this was the optimal tech approach though, since like I said - I ran into trouble very quickly with these smootchy little vessels.
My race was something like
+some economy
+creativeness
+logistics
Technologists
+some propulsion technology
+social production (I'm not actually sure whether i had this one in the final race I picked)
Oh and one more important thing! Can you randomize your opponents or do you have to hand pick them out?