If you would grab a big handful of the “BaquaGoo” you’ll notice how sticky it is. This goo causes the sand in your filter to greatly clump together. Additionally this goo will cause increased chlorine demand, that’s the main reason we highly suggest a sand change once the conversion is complete. Deep cleaning won’t help the cause much just yet.
I suspect you’re VERY close to passing the OCLT. Once that is complete then is the time to change out the filter. Clearly some of the chlorine loss is coming from the filter as is the CC level, but just go steady. It’ll be addressed soon.
You are also at the point I suspect we can start slowing down some, especially since it’s so dang cold here in Ohio. At this point most your chlorine is used during the day by the sun as you have zero CYA to protect it. To save a tad bit of chlorine you may (or may not) want to only add it overnight and hold off adding during the day. This will minimize the loss and expense. Then again, at least here in south-eastern Ohio all we’ve had recently is cloudy days…….