You didn't do this -- and haven't, as far as I've seen -- but sometimes posters create "OP pls nerf" threads because they are legitimately unaware of some aspect of the game. It probably seems a bit quaint now, but there were people complaining that Cataphracts and Banner Knights were impossible to resist when the game was new.
But this thread isn't that. I don't think anyone can read the thread, in whole or in part, and come away with the impression that you don't know what you're doing.
edit: you should consider packaging your changes into a mod and putting it up on Nexus. That's one way to get more feedback.
Those issues are inseparable. That which makes infantry and cavalry vulnerable also enhances the effectiveness of archers. Approaching the problem from either direction (archers OP/armor doesn't protect) will get you to the same place in terms of solutions. They all work, but what Dabos has found is one of the cleanier methods that shouldn't impact other areas of the game anywhere near as much as other solutions. For example, Armor Does Something making tournaments take forever because high armor values + crap weapons means you spend minutes whaling on a guy before he drops.