Honestly, Midnight Blade seems a bit better with your available ninja. If you swap, I would try get Kimimaro to 3 stars then use him with Sasuke and guy or use Sasuke and Kabuto. (MB skills being Sealing Slash, Lightning assassination sword, Lai beheading, Intent of the warrior/ lightning enhancement and root of the warrior. Summon can be either furukomaru/ ninja cat, or Serpent/white snake.

Honestly, your current team isnt bad at all for FTP.. But the reason your progress might have stopped is because your 'Power' is just low for your level.