Received my new WSM 47 yesterday and decided to try it out this afternoon to cook a chicken. I started the fire at about 1.15 pm using a weber chimney starter poured onto a pile of unlit coals once they started turning grey (I used a whole 3kg bag of Weber Long Lasting briquettes in all) and initially had the water bowl in place filled less than a 1/4 with cold water. A medium chunk of hickory went on followed by a spatchcocked chicken on the top grill. All vents were opened fully.
After an hour the temperature had barely got above 50oC so I removed the water bowl, kept the vents fully open and waited. The temperature slowly started to creep up but as of 4.30 it's only reached 110oC. I was aiming to have the chicken ready for 6 but at this rate it's going to have to go in the oven.
Any advice?

