Ok, the strap issue .Having only really played acoustic in public, i recently decided to try playing standing up. I concluded that you kind of start higher up and look like a twaat and then work your way down the body,your muscles get used to the new positions,if slowly. I hated catching a glance in the mirror and seeing a Level 42 style guitar slung up there,so it's working its way down,it's about Hank Marvin level now. You need to get the angle of your wrist right so, too high or low and ,mucked up tendons here we come.
i tried playing it in a Jimmy Page stance X years ago and just about strained my wrist,thats why he is/was so much more of a moth*rf.....than most playing so low, so fast,so sloppily,so well...
*degenerates into string of expletives*
Start high(er) up and try angling the guitar relative to your body (point neck up or down) do this when you are alone and sit down to jam with your mates.
Accuracy,you say? hmm interesting concept..