Thanks. Price of Progress was awesome all day long. My plan was to get in around 10 damage with creatures, then burn out my opponent for the remaining ~10 points. Price of Progress goes a long way towards accomplishing that; it consistently did 4-6 damage to my opponents. Dealing the equivalent of 1.5 or 2 burn spells with a single card seems like a good deal. Although I did about 4-8 damage to myself each time I played Price of Progress, the deck is so aggressive that it didn't really matter. I was never hesitant to play Price, as my life total was always higher than my opponents and those extra points of damage were what allowed me to win games.
I played around with Figure of Destiny in Goyf Sligh, and I really liked it there. One of the main appeals of Figure over Kird Ape in Goyf Sligh is that you don't have to fetch out your Taigas in order to make it big; it functions off of basic Mountains, so you only need to fetch out Taigas to play Goyfs. However, in Zoo, you almost always have a Forest on the board. The manabase of Zoo is a lot more conducive for supporting Kird Ape than the manabase of Goyf Sligh.
Also, in Zoo, I don't know if I really want to be spending mana to pump Figure to a 2/2 on turn 2; I'd rather be dropping a Qasali on turn 2 and swinging with a 3/4 Ape or a 4/4 Nacatl. Similarly, I don't think that I'd often pump Figure to a 4/4; I'd rather play a Goyf or even a Thoctar. Figure is definitely good, but I'm not sure that it's really any better than Kird Ape. Kird Ape just seems like a better fit.
The additional point of toughness is definitely relevant too. I run Volcanic Fallout in the board.
Congrats on the finish. That's an interesting idea, I hadn't thought of that. I'll definitely test it out.