Take your time and have fun. Looks like a good plan to me. You may want to get some other food for your guests in case it is not done at exactly 6:30. Pulling it off early would be a mistake. You just need to be patient until it is probe tender. Resting is also important. You can keep it in foil and wrapped in a cooler if need be so I would give myself plenty of time.
Jim - KCBS CBJ
Porcine Perfection BBQ Team
18.5" WSM | Packer Green Thermapen
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