I find that up to 20 pts of exploration or so there is a measurable gain in finding more roots and stuff and after that the investment is not as important as other things. Up to 10 is essential.
I wouldn't worry about making sure your food gives fep until you are sure of a secure food supply. Low q food still fills the belly and keeps the character alive. Some low q fish -eels, plaice, sturgeon give fep even at quite low q that is below 10.
In fact, if you are near water, I would go so far as to invest in either Stone working (to make rock lobster lures) or Carpentry (to make wood fish lures and a house to protect your baskets and supplies from decay) so that I could check out the local fishing. If they rarely bite you can use fishing as a back up potential source of food. If you are popping plaice and sturgeon out of the water as fast as you can throw in your hook, you are in gravy. Note also that if you are fishing mid-day and mid-night seems to be the worst times to fish and dawn and dusk the best times.
Plaice gives perception fep, and perception fep does much the same as exploration. It allows you to spot more herbs and things.
Next time some stinking bear attacks your poor defenseless character and then camps your helpless form just wait until the bear is not aggro'd -the picture of the bear in the top corner will disappear. Then, despite being unconscious, mauled and bleeding log out and go put on a load of laundry or make a cup of tea. After five or ten minutes log back in. If you log in to hearth you may be far away from the bear. Failing that, snuffling around and unable to find his snack, the bear will have wandered off some distance and it will be much easier for you to stand up, scoot off and put a rock or a tree between him and you and then tiptoe carefully off in whatever direction leaves the obstacle between you and him.