Solo alpha outpost Dino’s?

So, I went all in on ossidons at first, then realized they knock the boss out of bounds long before the boss is dead, or it gets tossed in the air and they can’t kill it before times up.

I have since thrown in 10 high level theris, and a thyla to do gnash on the boss.

But still have difficulty getting it done in time.

Current set up is 10 theris, 20k ish hp, 400% melee (normal saddles as I have no BP yet)

8 high level ossidons, 22-25k hp with 350-400% damage. Also normal saddles

I have 2 Stegosaurus that I use on passive and have half of each Dino’s on each side following it on aggressive so they defend the base, and come back to the stegosaurus and reset.

I typically ride the thyla in 3rd and 4th wave while piloting a thrall to shoot bronto legs, and gnash the boss.

What changes should I make for more regularly completing alphas? More theris?

Should I drop down to 2 ossidon and go in with 10 theris each side? What are you guys using?