So with the size changes...
Huge Agta
Hit Dice: 8d6+48 (76 hp)
Initiative: +0
Armor Class: 21 (-2 size, +13 natural), touch 8, flat-footed 21
Grapple: +23
Attack: Slam +13 melee (2d8+11)
Full Attack: 2 slams +13 melee (2d8+11)
Space/Reach: 15 ft./15 ft.
Special Attacks: rend 4d8+16
Saves: Fort +8, Ref +6
Abilities: Str 32, Dex 11, Con 23
Skills: Climb +19, Hide +5, Move Silently +9, Sleight of Hand +11
Medium Agta
Hit Dice: 8d6+16 (44 hp)
Initiative: +2
Armor Class: 20 (+2 Dex, +8 natural), touch 12, flat-footed 18
Grapple: +7
Attack: Slam +7 melee (1d8+3)
Full Attack: 2 slams +7 melee (1d8+3)
Space/Reach: 5 ft./5 ft.
Special Attacks: rend 2d8+4
Saves: Fort +4, Ref +8
Abilities: Str 16, Dex 15, Con 15
Skills: Climb +11, Hide +15, Move Silently +11, Sleight of Hand +13
Small Agta
Hit Dice: 8d6+8 (36 hp)
Initiative: +3
Armor Class: 21 (+3 Dex, +8 natural), touch 13, flat-footed 18
Grapple: +1
Attack: Slam +6 melee (1d6+3)
Full Attack: 2 slams +6 melee (1d6+3)
Space/Reach: 5 ft./5 ft.
Special Attacks: rend 2d6+1
Saves: Fort +3, Ref +9
Abilities: Str 12, Dex 17, Con 13
Skills: Climb +9, Hide +20, Move Silently +12, Sleight of Hand +14
Tiny Agta
Hit Dice: 8d6+8 (36 hp)
Initiative: +4
Armor Class: 22 (+4 Dex, +8 natural), touch 14, flat-footed 18
Grapple: -5
Attack: Slam +5 melee (1d4-1)
Full Attack: 2 slams +5 melee (1d4-1)
Space/Reach: 2-1/2 ft./0 ft.
Special Attacks: rend 2d4-1
Saves: Fort +3, Ref +10
Abilities: Str 8, Dex 19, Con 13
Skills: Climb +9, Hide +20, Move Silently +12, Sleight of Hand +14
Check my math closely on those.