i agree with winston about pee pads + crate.
def confusing for a pup.
also, its good that you keep the visit short, but what i did for a while was take cassius outside and run around with him after he drank a lot or played.
eventually a puppy will HAVE to stop and go pee. then you can reward and praise.
also, after you bring him out for 5 are you putting him back in the crate? if not, you should, because he will not pee in it (shouldnt at least) then after 5 in the crate you take him back out for 5...rinse lather repeat.