Attack 2: 17 to hit, 8 bludgeoning
Attack 3: 16 to hit, 9 piercing
Attack 4: 23 to hit, 8 piercing
Attack 5: 27 to hit, 1014* bludgeoning (houserule +mod); stunning strike: DC 15 con save.
Rolls
Attack/Damage (1) - (1d20+7, 1d6+4)
1d20+7 : (2) + 7 = 9
1d6+4 : (2) + 4 = 6
Attack/Damage (2) - (1d20+7, 1d6+4)
1d20+7 : (10) + 7 = 17
1d6+4 : (4) + 4 = 8
AS: Attack/Damage (1) - (1d20+7, 1d6+6)
1d20+7 : (9) + 7 = 16
1d6+6 : (3) + 6 = 9
AS: Attack/Damage (2) - (1d20+7, 1d6+6)
1d20+7 : (16) + 7 = 23
1d6+6 : (2) + 6 = 8
Bonus Attack/Damage - (1d20+7, 1d6+4)
1d20+7 : (20) + 7 = 27
1d6+4 : (1) + 4 = 5
Crit - (1d6)
(5) = 5