I thought the general understanding was to always play at the highest level in the league you get your chest. Play in Bronze 1 if in Bronze, Silver 1 in Silver. Reason being that's where you get your RP/FP as your rating is at it's peak.

If you aren't keen on playing in Silver 1 for majority of the season, you might need to consider dropping and playing in Bronze 1. My main is in Silver 1 and my mini is in Bronze 1 and I get around 8-10 chests each daily.

Also, you can't be playing for win rewards as they are minimal at best unless you are winning in the early season whereby the pool is still large. Lastly, was 0.05 DEC a win reward for you in Silver 3? I haven't seen it that low unless its like 90% starter cards. Are you playing with Starter Cards?