Agree with others. Your soil PH is excellent, I wouldn't add a thing. You can add a no (or low) nitrogen fertilizer blend if you prefer but personally I wouldn't waste the money.
As Bill mentioned most cereal grains are extremely easy to grow. Just broadcast before a rain and you're fine.
Clovers, oats and rye all do well in partial shade situations. You do need to at least have a few hours of sunlight for them to do "well". Otherwise they will shoot up quick and thin out with time.
As far as your last question goes in regard to herbicide use - It depends on how much soil coverage you have on the trails you want to plant on. If there is good sections of open soil, you'll do fine. I've never used herbicide on my hidey hole foodplot and have no problem with a rye/clover blend in the fall. The key is good seed to soil contact. Without that, you won't have a great turnout.
Good luck!