Add NOTHING and wait another day or 4 if necessary.
When nitrites get to zero then add 2 ppm
ammonia and start the 24 hour clock.
It looks like your tank/filter is cycled ,but over loaded with ammonia that is too much for the nitrite bacteria to consume in 24 hours....
Let them catch up.
Test again tomorrow.
I will say with some confidence that when your tank/filter is cycled you will easily be able to stock 100%.
You are growing way more BB then your tank will probably need?
What is your final stocking plan?