First Board - Help!
Don't look at that. Look at the company size charts they are more accurate to the specific board you're looking at. Personally I think you will be fine on a 166. I'm 6'3 225 and rode a stiffer 166 for 5 years. When I bought it I weighed 205, and I still have a hard time flexing it to get some pop out of it at my current weight, I could easily ride that board at 265 and be comfortable. You should be fine man.
It comes and it goes. Get it while it Lasts.