The cop is there to ticket you if you appear to be breaking the law to him. The judge is the one who will listen to your reasoning and decide if you or the cop is wrong. The gill plate forward defense with an official email from DFW is pretty strong. I'd be confident but concerned about a court date after receiving an official interpretation from the DFW like that. You can only make a reasonable interpretation of the law with the information you have to work with. Ignorance of the law is no excuse, but if you have the official regs and have attempted to get an official interpretation of those regs, what else can you do?
Granted, if you are snagging, shame on you. But if you are attempting to legally hook a fish and hook the gill plate forward, a lot of things can happen down there that can result in a hook outside the mouth. If I've been dragging the holes all day and finally find a fish that will chase my birdie drifer up the line and swim upstream resulting in the 1'0 hook outside the mouth, considering what I've learned, I'm tempted to keep the fish. If I'm fishing with a boat hook and 4 oz of lead, different story.
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Timbermans motto: The only good tree is a log.