Yes, I would leash him everytime he goes to potty for two reasons....one you can immediately praise and treat him and it ensures you see him do his business. I think the crate is fine in your bedroom, I only asked in case he was sleeping in another room away from you. What time does he eat dinner and what time do you take him out for his final potty break?
Ill try the leash thing. Dinner is 630 and final potty is 930-945
I did the same thing with Luke. Always on a leash while potty training although the backyard is fenced in. No running or playing. When he was done doing his business we went back inside, leash off and then we could go back out to play. Always "separated" potty time/on leash and playtime/off leash, don't know why but have done the same thing with all my dogs and always had good luck with it. Luke was a breeze to potty train. And I was lucky never had to get up in the middle of the night to let him out. He slept from 11pm to 5am pretty much from day one as young as he was.
Mine has only slept thru the night once since we've got him. Most of the nights it's getting up sometimes twice to let him out