I thought the Explosiv! was very similar to the Mantis also, just more power actually for the WC. Have you got any plans to try Mantis Power Syn? I ask as Tennez tested it and said he had the best results that weren't nat gut. Sounds promising! I've got a set and I'm going to test soon so I'll update if you want?
Interested to hear your thoughts on it though. Didn't like the comfort syn much, was "muted" in feel for me...