As others have mentioned, your foot isn't going to interfere with the front wheel except at very slow speeds. The solution is to temporarily move your foot back on the pedal and take the few strokes during that sharp turn on your toes instead of the balls of your foot.
If you are using clips or clipless, you'd be wise when maneuvering at that speed to have your feet free in case you misjudge or lose your balance. At anything much over 5 mph, you wouldn't be turning sharply enough to experience the problem.
If you are correcting during a descent at any speed at all and have to input that much of a steering change, then chances are you will be going over for reasons having nothing to do with overlap.
Re Cycle - it sounds like you may be a little up tight with your new bike - that's ok. Just keep riding it and you'll start to feel much more comfortable. Good luck.
Caruso