Hello! Sorry I'm late to the party, but wanted to come in and describe how I modified my Hernandez FX cowl to see if it would help anyone here. The cowl is absolutely wonderful and I love it, but again I had issues with the jaw section being too wide for my head. To be fair, I have a wack head in my noggin itself being quite large but my neck being thin. However, I was able to fix it in a few easy steps!
Here is the cowl on without any modification (with some paint, I weathered with some yellow oils in each crack, where the ears come out on the top, and the top seams from the ears; some grey over each of the cracks and scars in the cowl; and finally a brown over every seam of "sewing" which left a very good subtle result)...
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As we can see, the bottom didnt really form to my neck and the sides were far too wide. So, I did the most sensible thing I could consider and cut off the central neck column. Upon doing this, I added some marine vinyl (attached with some CA glue) and velcro on the sides along with some soft side velcro on the inside of the cowl body neck so that it was now a velcro attachment.
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After this finally I added in a small pad of foam at the back of the head to push my head forward just a small bit to help my eyes fit in more and also make it so that when I turned my head the cowl turned with it and it wasn't my head swimming in the cowl.
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The cowl now goes on with a simple velcro closure that now pulls it in tight to my head and although it now dows fit very close to my neck....I think the final result is worth it. Here is a side-by-side with the left side being the before and the right side being the after!
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Hope this helps!