This is where my confusion as a player comes in. To me the term "statistics" is too broad, and would cover virtually everything you all listed.
@Quandry: Why do you suggest Speed not fall under the "statistics" umbrella? I.e. if I have to use my own statistics, do I not use my own Speed as well?
Unless I'm supposed to interpret "except you use your own statistics" as "except you use your own statistics unless the animal form's are higher"?
EDIT: Just to add a comparison of my own likely stats vs the animal form, even if we interpret the rule as "unless the animal form's are better" - none of the form's are better (except Speed).
AC: 17 + level (8) = 25, vs my own (using regular Hide armor as an example) 10 (base) + 10 (trained prof) + 3 (DEX) + 3 (Item) = 26
Athletics: +14, vs my own: 14 (master prof) + 4 (STR) = +18
Unarmed Attack: +14, vs my own: 12 (expert prof) + 4 (STR) = +16 (and this doesn't include any bonus from handwraps if I have them, so could be higher)
Damage Bonus: I assume this doesn't stack with my own bonus, which will already by higher than +5: 4 (STR) + 5 (Rage) + 2 (weapon spec) = +11.