I beat these teams all the time they are not that hard to beat once you are fully leveled and trained.
That the teams I use, fully upgraded and all traits unlocked.
I can’t win half of GW matches and my defense rate is at 20%, so I don’t see why this setup needs nerf.
Go with good ol’ Treant, Alchemist, Valkyrie, Banshee and use Banshee to pick off the most annoying threat (probably Sylvanimora in the first team, at least, then Krys).
Hellcat/Alchemist/GobRocket/GobRocket is the safest option for lower level players. Especially with the fire link traits unlocked.