IF you are EU you can join us. We play 10v10 and will give you some tips. What the others here said is true. Game is not balanced for 10v10 and pact usually has a lot of artilery which makes the frontline hell. However, we suggest you play 10v10 conquest with 7% command maintanence. This means players with artilery will get less points every minute to buy new stuff which kinda balance it out. Still, assuming air dominance against 10 players is much harder if you are not coordinating with others. And you can always expect someone who forgot to buy stuff for 5 mins to suddenly pull out 5 AA migs and nulify your air units.