Lower your tank temp. Constant 65-70f if livestock will be ok.
What is your current temp?
I has a lot of BBA when I was closer to 80f and I even had 2 pressurized co2 systems with EI dosing and did all kinds of thing about light.
I don't want to sound like I'm telling everyone have a colder tank as a solution for all issues, but algae seems to behave better now.
The other factor I believe* had something to do is good flow and over filtration.
I wasn't doing water changes. Every 6 months like 20%... Using RO/DI water for top offs.
* i believe = I'm not certain.
A heavily planted shrimp tank is possible!