Am I doing something wrong? I am under the impression you get them from exploring the woods, but I now have 21 sticks, and 34 pitch... And am stuck at 4 stones, and those were from like 20 pitch and 15 stick ago.

I'd also love to take this opportunity to throw in suggestions of "perceived randomness" vs "real randomness" because I have had 4 stones for at least 20... Maybe even 30 explorations and a check if a certain event hasn't happenned in 20 times to trigger would be amazing

You have a much better chance of getting rocks from the field than the forest. In the forest it's a 10% chance and in field it's 30%