Trip stack formation

Corners - One guy flat, one guy sharp corner, one guy deep corner (far side)

RPO -   inside guy in trips (far side

Crossers - High low  going one way and one low coming back the other way

I am in campus legend, yet I can't stop this youtube offense consistently. Played it 4 games in a row, finally succumbing to a guy who actually added some nuance and user skill in the mix.

What I've tried

Corners-  
1. Run like a cover 4 palms. The LB, even when pushed outside and at 15 and 20 yard depth can't get there.
2. Run 3 Double Sky - Takes away the corner route well. But they can bomb you down seam and doesn't stop crossers or qb scrambles
3. Cover 6 - Same as #2

RPO 

I've done 1, 2, and 3. All variations, plus tampa 2 drop. And I'll come out with it looking like cover 2, 4, 6. Nothing helps

I'll shade underneath + pass commit with flat zone from inside LB. Put inside LB in man and pass commit. Usually when they're not staring at the cb, completely frozen, they still somehow lag behind the RPO and never get there or get in position to break it up.

When you user the RPO, they just get "Stuck." They don't animate for the pick and you can't really move. 

I don't know if I am bring them too low, too inside, but if I bring them outside at all, they're instantly blocked.

Crossers

Same plays, but I'll shade underneath or hot route hooks to 0 and then the high crosser is wide open

I understand user players a big role and I do take a lot way, but I have to sweat my buns off every single time. 

What concepts work best?