Agree with Saunders.
Without the stride in you are also not balanced at impact, this is highlighted when after your shot your back foot has to move to stop you falling over. A bigger base means a stable base. You are what people refer to as caught on the crease, not forward not back. If I was to guess I'd say you get out either LBW or caught behind. Also with a nice stride in you can transfer your weight through the ball which will help with timing. A simple drill would be to get a mate to drop a tennis ball out infront of you, enough that you need to step to it, let it bounce twice then step and play your shot. To check if you are balanced hold the shot for 3-5 seconds. If you are as steady as a rock you've got it, however I'd suspect you'll wobble and have to move your feet again. This is a great way of feeling and understanding how balanced you really are. Then just progress the feeds onto underarm bobble feed, over arm, bowling machine, full bowling. Good luck.