Putting the bulb a bit deeper won't harm it, in fact in most cases it's better for it. The plant will still grow to the light and the slightly deeper it is the more secure it is, and warmer.
Regarding disturbing what's there, you can move plants just make sure to get as much roots with them as possible, they don't mind being slightly disturbed but it's getting quite cold, try not to allow small plants to frost, so keeping them all together might be best.
Well drained soil basically means don't drown it lol