WBT connectors are excellent, but will probably cost more than your wire. PartsExpresshas all manner of inexpensive spade crimp connectors. 16ga wire is not that thick, IMO. 8, 10 and 12 what I would consider thick wire. Are you sure the cable you are using is 16ga? RCA connectors are not normally used in a speaker terminal connection - could you mean that you'd been using banana connectors?
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What size spades can the terminals accept? If your terminals can accept them, I like the Audioquest 1/4" spades because their semi-circular shape allows for a more secure connection if you rotate them a quarter turn or so after sliding them into place.