Herrgh

You can't really use too much anti-fog but it only works up to a point.

I drilled lots of holes in my FMA Fast helmet.  Helps a bit but on hotter days I use a baseball cap 

As Per Mr Helmet - my Anti Fog fanned goggles are great when it is just the fogging - I also augment them with MuckOff.  The problem arises when my overhanging Neanderbrow gets saturated with sweat and it literally pours down the lenses through contact from the eyebrows.  I have just invested in some headbands to see if it helps at least divert the liquid away.

Matters are not helped by me being overweight, overloaded (full MkiV Osprey kit) and growing my hair long.

I used to have insane fogging issues, tried cat crap, muck off etc but nothing really did the trick properly until I just ended up biting the bullet and getting the full novritsch anti fog setup alongside the rx lens inserts - now I don't even need to coat either my goggles or inserts with anti-fog as the unit on nearly full whack is enough to give me mostly clear vision. Best decision I've ever made - although maybe it's not a one-size fits all affair as I just run a boonie rather than a full helmet (still use a full balaclava though)