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I'm in Silver 1 and also earn 5-6DEC per win with bonus from GF

Donno why I get so little DEC(5-6) for each win at Gold 3. Get same or even less than what I got at Silver. My ECR is at around 70-80%. And there were 20-30% bonus up from continuous wins.

That's why I rent out my card and stay in Silver rather than move up to G3. The advantage of G3 is 6 daily reward chests but I can use rental income to buy cards

Good choice. See how they will change to motivate player to move up league.