Or is my technique just wrong? What do you guys think?
Without video or pictures how can we tell. Without a board stand straight up on your toes , feel the weight on the balls of your feet and your toes curling up and getting tired , if this is the feeling you get riding toe side , it is all wrong . Now squat and get the weight on the ball of your foot , this should feel a whole lot easier. Eventhough you are attached to the board , imagine that you are not tied to it and you have to maintain your balance over it. Just like the people balancing on a log in the water, if they lean over , they will fall off .
Also riding slow is more work, it takes longer to turn and you might be trying to force it too much. If it is too step for you and you and just skidding down on a front or back edge , it will get tiring since you are constantly fight gravity, if you are coming across the slope to control your speed and you have bad edges or you will be fighting the urge to skid with the back foot.
1) think about balance on the board
2) turn using bending you knees and shifting you weight and not kicking your back foot around
3)pick an appropriate slope for you level, you should feel comfortable pointing straight down , if not , it is probably too steep.
4) relax your toes , those muscles are too small and weak.
Hope this helps