I am not real familiar with the hexamid. But, I have given lots of thought to going a floorless/netless tent; however, I figure with ticks in Arkasas, and mosquitoes, etc, I'll just carry the little extra weight. If you want to even out, just dump something else.
Also, the net weighs 6 oz, lets say your velcro headnet weighs 3 oz. Therefore you get uncomfortable sleep for savings of 3 oz.
Yea, some will say, carry deet, etc, but that crap stinks.