Copying here my recent message to SC, seems relevant...
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Dear Supercell developers! My comment is about Clan War (CW) matching system, which always was the main subject for massive complaints among Clash-of-Clans users. We the players always knew that the matching system was awry, and the development team tried to fix it many times, vainly, to say the least. But, recently, after December Update having introduced TH13, the matching system went completely nuts. We start CW with a balanced team, we don’t allow disbalanced bases. The system keeps matching us against a much stronger counterpart. For example, the recent CW, which we (#2R8YP0JL[COLOR=#000000][FONT=Tahoma]) started yesterday, on Feb 17th. We have a team of 1x TH12, 4x TH11, 1x TH10, 4x TH9, 2x TH8 and 3x TH3.