I had some problems with higher angles last season as well. It was also my first season on plates. I could rip at 40's but when i went 50's and over things just got squirrelly. So what I did was increase my binding angles 3 degrees or so every time I went out so that the change was very minimal and I hardly noticed it. I worked my way up that way until I was riding 55deg+ angles. This method worked great for me.
I wouldn't focus too much on overhang as these guys are stressing about. It's amazing how far up you have to tilt the board on edge to have issues with boot drag. As mentioned earlier tilt your board up on edge to see when the boot will be hitting the "ground" and you'll be surprised how far you can get it even with one inch of overhang. Forcing yourself out of a comfort zone to ride steep angles is just not the answer in my opinion. If you take small steps like I mentioned above you'll find yourself riding steep angles in no time without the harsh learning curve of jumping to 15/-5 to 55/55 in one leap of faith.
In summary I would start at 40/35 ish and go up 3-5 degrees as you feel comfortable. This can be every run, every other run, every half day, every day, etc. Take it slow and work your way up!