I think resource saving problem come in two part:

1. You lost your resources during defending your village.

2. You lost your resources when you fail your attack (fail to gather enough resources to cover your troops cost).

My suggestion is

1. Increase league bonus

2. Increase resource collector production

3. More 1 gem resource collector boost event

4. Increase resource collector boost from multiple 2 to multiple 4

Looking forward for next update change