I have the same set up that you have without any mods to the CG and SFB, yet...
I'll start with maintaining the temps if the SFB. This is something that you will have to monitor through out the cook. I start off with a load of briquets in the chinmey and once they're ready, I dump them over a fresh bed of lump AKA, the
minion method. Without a raised charcoal basket, the fire tends to burn out a little quicker from the lack of air flow, so I check my temps about every 45 minutes or so. Keep the side vent and the stack vent wide open also to help air flow. I also find sometimes after I have added more lump that things can sometimes stagnate a bit, so I crack the SFB lid open for a minute or so. This usually happens when there is a lot of ash. It will hurt your temps for a bit, but you are giving the fire more oxygen to revamp things a bit and the temps will recover quickly. Another reason to make the appropriate SFB mods for total air flow...
I flip my ash pan too. Use the ash pan handles and position the flipped ash pan so it meets the SFB opening, this will distribute the heat throughout the MC more efficiently. Some people line the flipped pan with heavy duty foil, enough to extend over the two openings at the ends of the ash pan, leaving the sides open so the heat can circulate through.
I've tried the water pan and honestly haven't noticed a huge difference either way. It's a good way to keep your temps in check if they get too hot and to keep some moistier in the MC, but most likely, you will be fighting to keep your temps up to 225 instead of trying to cool things off. I've kind of moved away from using the water pan for ribs.
As for the smoke, I would try to go lite on the smoke first time around, especially with mesquite and hickory. I've been using apple wood chunks lately which are not as strong as mesquite and hickory and I only use 3 to 4 chunks for a 3-2-1 cook. Too much smoke of any kind will make everything bitter and nasty, especially with mesquite. I personally wouldn't use more than 4 chunks. If it's not enough, then use more next time. I would rather spend all day cooking something that doesn't have quit enough smoke then spending all day cooking something that has way too much smoke and tastes horrible.
And the most important thing of all, remember that BBQing is thirsty work! So have plenty of ice cold beer on hand. And one more thing, have fun! I love spending the day BBQing. Have a great day...
