The sand will settle when it's coated with bacteria. That's what makes it heavy enough to fall out of suspension and settle to the bottom. My 125 took about a week with the pumps running and some LR
to seed it.
Did you add the shrimp to help the cycle move along? Adding some LR
now would help with the cycle too. I'm guessing that the LR
you are getting is fully cured and that's why you are adding it in small quantities over a few weeks period of time, and after the tank has cycled.
As Steve said, you want to keep the pumps running too. Otherwise when you turn them on you will get another huge sand storm.
When I set up my 125 last year I found that even after the tank had cycled I created a new sandstorm anytime I did anything in the tank. I was told by the members here that they could lift a handful of sand and it would settle in minutes. Well guess what. I can do that too now
Sounds like you are the right path, going slow