I'm not overly concerned about fog either. But I don't like the curve to start rising only at zone III or even more. An EI of two stops less is a PITA.
Try using 1 tsp each of sodium carbonate and borax in a liter of water to dilute your glycol solution 1+50 for a quick and dirty test. This should give you a fairly linear plot from zones 2 on up with development of about 8 minutes at 70 F. If actual fog is too high for you, add some bromide to the working solution. I am not overly concerned about the fog I have seen, but if you use some of the alternative processes as Sandy does, double fog density means doubling an already very long exposure to UV light.