After going back through this battle and taking out Natural Armor from the cavalier units' attacks only, I'm at positive 74 hp.
It helps if I read my own character sheet notes, my slams should have been dealing more damage thanks to Warshaper's Morphic Weapons ability. I've corrected it moving forward.
Then five foot step in towards the foes if needed despite 10 foot reach.
Then full attacks, focusing on the cleric first, then other nearby units, starting with riders and then their mounts: Four Slams, Full Power Attack -
1d20+6=26, 1d20+6=21, 1d20+6=10, 1d20+6=18. Critical threat confirmation roll for attack number 1 -
1d20+6=14. Damage -
2d6+15=22, 2d6+15=22, 2d6+15=23, 2d6+15=20. Additional damage for crit if succeeded -
2d6+15=24. I have no idea if there are any buffs coming from anyone, but if there are they weren't factored in to the above.
Free trip attempts for hitting with attacks via Smash and Grab racial ability:
1d20+11=29, 1d20+11=26, 1d20+11=20, 1d20+11=26. That only includes a +4 for being large, if getting to count my slams as bigger weapons increases that size bonus, then add another +8 to those rolls, since my slams count as Gargantuan sized weapons between my Clobber racial and the boost from my Warshaper ability. If any of those succeed, the rider struck by the blow is becomes unmounted and prone! Yay! I can't believe I forgot about that ability until now, it's so amazing.