I'm not saying to forfeit Ahsoka altogether. Just saying that it's debatable whether you need to rush it.
In my bracket maybe 20-30% have biggs (from top20). And if they do - just start off with sniping him first. They have almost no way of generating enough target locks for him to survive past round 2. There is not much tactic when you start fleet arena - just nuke everyone out of the sky.
0) Avoid to become level 8 (Arena Start) for like 10 days and just collect energy and shipments.
Great tip, but had to implement, just because.... ppl want to play. Waiting 10 days and changing your timezone at the same time is kinda overkill imo. 5-7 days would probably suffice, but depends on the individual. Also - don't underestimate whales. They will spend if they have to to get ahead of you ;)
All in all great tips, would follow almost all of them if I started again :)