ok, the fist problem is easy to clear.
don´t make pic´s when you want...make them when the snake "want´s".
I just go around and control the snakes every few days...if I look under the pice of wood and the snakes look´s good I take the camera and make some pic´s...that´s all!!!!
most of the time they look not good...they lay there very unnatural, so I wait...one day, or maybe a month...
if you don´t waste time or make trouble they will stay calm for a few shots until they wake up and try to find a new hiding place.
the other way is to take them out, put them on a hand and make the pic...you have to act fast!
if they wake up it is too late...don´t try it and put them back!
that´s all I do...mainly before feeding, that´s the time where I have to disturb them anyway.