Once you figure it out, it is very simple.
If you have BBA or any kind of algae issues for that matter, and you dose according to the sticky, then you have a light/C02 problem.
With highlight, pressurized C02, you have a hotrod/racecar, you get in, start it, put it in gear, then you floor it, everywhere you go, wide open, crazy huh?
The light is the throttle, how does a throttle work??
BBA says your C02 is not good enough to supply the plant uptake will all the carbon it need's for the amount of light you are driving, throttle it back some.
A large glass diffuser will give you much better control for this kind of environment you are forcing on the plants, as I said before reactors can and do work, but only up to a point, PVC reactors are so DIY, any of them.
You did the upgrade to pressurized, but didn't upgrade your diffusion method. hate to say this but even amano uses all glass diffusers, you have better control and better results.
The BBA and algae issues are telling on you, I can grow some plants, I know what is happening and this is it.
If you want to push the limits of the plant uptake, you need better diffusion. period.
Keep dosing according to the sticky, keep running C02, but ease up off the throttle a bit, find that sweet spot where the plants are saying yes and the algae no. you don't have to buy glass if you don't want to, but you do need to ease up on the light for the reactor.
Clean out all the BBA and focus on plant growth and their health, see what happens... Promise!
Don't try to make the plants grow any faster than they can, without knowing their limits.
For a large tank get a 2" disc for best results, (AquaticMagic-ebay)get 3 of them and learn how to use them. always soak your diffuser disks a few minutes before use, don't use them dry.
Reactors and glass disc's both work, but if you want to push alot of light, go glass or back off the light some.
, your such a child sometimes, just piss and moan, no help at all.