If you form a premade on your server for CT and que with 8, the que is insanely faster.

The problem with Q's on 24 man content is that you end up with odd ball scenarios

Imagine 3 groups queing for CT

Group 1:
1 Tank
4 DPS

Group 2:
0 Tanks
4 DPS
2 Healers

Group 3:
2 Tanks
2 Healers
2 DPS

Now imagine there are 2 tanks in the que solo, and 20 dps in the que solo, and 1 healer in the que solo with these 3 partial mades in the que.

1 tank will go to Group 1, and 1 tank will go to group 2, leaving group 2 waiting on a tank. 2 Dps will go to Group 3. But it's now possible for a 4th partial made group to que with 2 tanks and 2 healers and they would get instant que even though Group 2 has been in the que longer. Because the system does not break up partial mades. Group 2 needs 1 tank, but there are not any tanks in the que solo to fill that 1 tank spot. So when Group 4 joins with 2 tanks they take group 2's spot. Group 2 is like "wtf" why no tanks join us?

Because they got stranded.

In short, you should never que alone. You will get a faster que as 4 dps, than solo dps. And the fastest que possible as 2 dps and 2 tanks.