Probe the flat, not the point. The point will be tender for a good long while. The flat has a much shorter window of opportunity.
When you get to 190 or so you need to start probing the flat. If the probe doesn't slide in and feel like peanut butter, cook another half hour...then try again.
Get the flat where you want it...the point will follow just like a loyal puppy dog.
"BBQ...it's just heat & meat" - Circa 5/10/11 - Quote by Cook