S550 Liftoff Failure - please help!

I have been working on a s550 build on and off for quite sometime now and I am stuck at the same issue I was stuck at before. The hexacopter will not lift off when throttle is increased to 100%. I am using a 5000 mah battery and apm 2.6 flight controller. Here is a link to a video of the failed takeoff. Any suggestions would be greatly appreciated. Thank you.

Are those props all spinning the correct direction?

All of the props are turning backwards…

Yep, backwards.

Can you feel the air pushing up? :slight_smile: