Go higher, there has been TH5s in champs, and up where you're at the defenses is either no mercy or stupid attackers, so go up and play in sessions (like an hour or two at a time to make up for those trophies that you lost during defenses).
P.S. I heard that leaving your TH out helps a little bit because there is other low lvl players out there that would love to see a TH snipe, sure you'll lose some trophies but hey, a 1 star is better than a 3 star





