Deceased, what line of work are you in?
I'm in the oilfield and have been struggling with the same problem for 2+ years. I have tried a combination of almost everything and found out field work and VV/VW mods don't mix. I've had the best luck with a mech mod and a carto tank. Between water/perspiration, sand, other small particulates, dropping, falling into(I keep it in my breast pocket), and all other forms of stress you can put on a mod, the aforementioned is the best combo so far. I have broken most of the components and even down here in Argentina, where I'm currently working, I have been able to locally find replacement parts to hold me over until I get home. I will continue experimenting to find the best combo, because for me a carto just isn't enough anymore, and should I find something I will let you know.
If you come across something that works really well please let me know