The Corinthian Helm as a phallic symbol?

[Tarbicus]

True, but then why not just increase the size all together? That would seem easier than creating that ridge line...

With the eyeholes being further forward, visibility would be greatly reduced? Lifted up onto the top of the head the helmet would slide down or fall off? (I can raise my corinthian up on top of my head. A bit wobbly, but it stays there)

Nope. The Corinthian and the "Chalcidic" are synchronous in time.
So for aperiod is the "Illyric"....And yes Peter Raftos offered evidence for the padding.

Thanks Stefanos.