Wow those are some SERIOUS over reaches of authority. Not only can you have an openly carried firearm in the National Forest, but you may SHOOT in the national forest (with certain conditions).
What was the written warning for?
How can they do a traffic stop with no probable cause or RAS? These are some serious constitutional violations. I've open carried several times in the gorge without problem, though I have not had any LEO encounters. Were these forest rangers? If so, you need to complain immediately to their supervisor. I believe they're based in Winchester.