I had the same question and I decided to stay in Silver for battle and go to Gold at season end. I see a big gain when I open seasonal Gold chests than Silver chests, even I got more Silver chests.
I also rent out the remaining CP to get more DEC.
Once my deck is strong enough as you said "suitable level for both summoners and monsters", otherwise it may be more suffer of losing battles and I get fewer reward chests.
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I decided to cross over to the Gold side to test it out. If it doesn't go well, I'll just drop to Silver and stay here