I have not read every post so forgive me if someone has posted something similar already
How about making the number of minions scale as you lvl? (even con mobs.)
1-20
3 minions = 1 hero
1 lts = 1 hero
1 boss = 2 - 3 heroes
AV = team (4-8)
20-30
4 minions = 1 hero
2 lts = 1 hero
1 boss - 2 heros
AV = team (4-8)
30-40
5 minions = 1 hero
3lts = 1 hero
1 boss = 1 hero
Av = team (4-8)
40-50
6 minions = 1 hero
4 lts = 1 hero
1 boss = 1 hero
AV = good team
Sounds logical to me and would accomplish giving you the feeling you where more powerful as you lvled.
Please keep in mind my numbers are just an example but I think they are fair. I am sure they could use some tweaking.
I think that 3 minions isn't that be bad considering in other MMOs if you try to solo a single even con mob you stand a 50/50 chance of dying.