try covering it so its like a little cave, at this age you will either have to stay up late 1:30am ish to take him out to wee or get up really early 4:00am to wee. Simply the amount of fluids he drink can affect the lenght of time he can go without but 4 hours so young is a very long time! Are you sure hes not leaving you puddles somewhere your not noticing?
Pups usually dont like to wee so close to home so they will try to pee out of their crate - I think your just going to have to get up to take him out - youve already mention him being dry when you got up early etc. This will need to be constant till hes around 14-15 wks id say, and it just means verrry long days for you - but if you want it to stick youve got to put the effort in now