If you plan to play in the champion ladder of the official league, Amazons isn't the best choice at all. They have low armour, so in the long term you'll lose a lot of players - plus they are weak against teams with a lot of tackle. That means dwarf at low tv, but almost all the bashy teams at higher tv. You'll get injured and you'll miss dodges. You can somehow counter that with Guard and Mighty Blow on your players, but they life expectancy will be too short anyway. Their playstyle is also quite generic - so chances are that you'll enjoy low tv a lot, but later it will end just like your norse team. Amazons are a good team for short formats without too many dwarves.
High Elves are a better pick, but in a competition like the champion ladder, any team that isn't bashy will be harder to play. Your first matchs should be nice if you play them well, but when the first MB/claws come, you'll lose very expansive players. HE are good but risky.
It means in both cases you it's likely that you got stuck at medium tv.
BTW, I don't understand how your strategy can be to have advantage in numbers if you want to play low armour teams. Dark Elves are a good pick for you I think - their players aren't as expansive as the HE, but they are also tougher than Amazons. The HE don't seem to suit your playstyle - since you should treat all your players as expansive starplayers.
I'm thinking maybe you should try the Lizardmen. They are fast and have 6-7 strong players, and they are almost always a top tier team. One of the best team to outmanoeuver your opponent. Just be careful with your skinks. They don't have a passing game, but it seems to be the best alternative to dark elves for you.