I agree with John on the pizza. I wouldn't draw any conclusions at all about your basal based on that. While I agree with Maurie about being safe and adjusting for the 29, now that you have done so if you start to see a pattern of highs I would change it back. But two numbers are not enough of a pattern, especially if one is from pizza which can really throw a monkey wrench in numbers.
I know it's hard to resist tweaking basals, when you are seeing high numbers, but I would wait until you see more of a pattern (sans pizza) or else you'll get more frustrated from the roller coaster of "too high" "too low".
P.S. I make gourmet pizza (very thin crust, no tomato sauce) and I eat one piece at a time with a salad; I've had some in my freezer for months now because I know I will wake up way high. Maybe I'll eat it when the power goes out this winter.
Sorry for the frustrating numbers, I dealt with about 6 weeks of it recently - I tend to procrastinate and look for explanations when I should be acting!