For the OP, as much as I'd like to give you an optimistic answer, I personally can't. Some guys have great luck gaining access. It only works for me if the person knows me personally b/c they know my character, morals, and values. Every person that knows me lets me hunt w/o hesitation.
I get rejected by nearly every single stranger I ask and it's not b/c of a sour attitude. I'm a pretty happy guy that has made a living with the little bit of charisma God blessed me with. I could've been a salesman, but I would have to truly believe in what I'm selling to be a successful salesman. What I've determined to be the primary cause of my dismal failure gaining new access is my lack of confidence. I've been told "no" by "strangers" so much I'd rather walk another 10 miles of public land than knock on another 10 doors. I remember stopping at 10 houses in one day just trying to get a shot at some turkeys (ya know, those big birds all the farmers complain about having too many of?). All 10 said "no" and my son and I politely went on to the next place. The 11th person we visited that day said, "I just don't let ppl hunt." Well, he happened to be working on a home project so me and the boy just started helping out while he was telling us all the reasons he doesn't let ppl hunt. 30 minutes later we had access to some great property.
Moral of this long story, confidence plays a role too. Good luck building any confidence when your first 10 stops yield "NO!"

Despite the fact I'm rejected so frequently, I still knock on a door from time to time. My success rate has improved slightly. Though I haven't developed confidence in that I'll be told "yes" I have developed a "nothing to lose" attitude. Getting the desparation out of my voice helped. I guess I should also note that I always go alone or with one of my young son's when asking and my truck is never covered in mud. I don't have long-hair or piercings. I speak well and carry myself accordingly.
Disclaimer: this is based solely on my experiences. I really don't want to hear anything from any of you about my character, understanding farmers, trying harder, blah, blah, blah. We've had a similar thread before and everyone wanted to tell me how my approach was flawed and that I just didn't give an effort

"stop whining it works for me"

I'm not looking for your feedback, just sharing my experience and opinions with the OP. I primarily hunt public land b/c of the above stated challenges/frustrations. Besides, I never get chased down the drive way by a mean dog when I pull out my WIHA map
