First off have you seen this site for list building?
http://traitor-legion.appspot.com/
Its awesome!
Onto your lists. The naked guardians are really not going to do much but die! Maybe stick heavy weapons in there and they can sit on your blitz. Your other Guardians are walking, if you have 50 points spare by the static gate as they can then walk out of that. Or drop the upgrades for wave serpents so your entire army is super mobile and use the speed of the army to support lots of rolling assaults.
Shinning Spears are good at killing RA vehicles and dieing, period. That said I often use them.
The eldar aircraft are good, so if you have some I'd see if you can fit them in.