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@pip
Zen rings are dead expensive, its weird that you're having problems with noticable chain tension issues. I use the vanilla 75 chainrings and have no chain tension problems; pretty even tension throughout the cycle. Have pretty much the same setup as well: Phil hub, EAI cog, Sugino 75 cranks + BB + ring.
BTW is this a Sugino Zen ring or a Sugino Zen messenger ring? Could understand if its a Zen messenger ring as they're pretty basic.
One easy thing to do is to swap the ring (if you have a spare) and try it with something else. Should help narrow the source of the problem.