Let's recap a few things you posted:
1. How did you get those water results? They are not from a TF-100 or Taylor K-2006C, so we have to question how accurate they are.
2 - Lets assume the numbers above are accurate, then:
** CYA at 30 is fine
** PH of 6.8 is too low. Add aeration to the water if able or increase the TA by 10-20 ppm which should help it rise a bit.
** TA is a bit low; As noted above, increase the TA 10-20 ppm
** FC is much too low. It should never be below 2, and depending on the CYA throughout the year, may actually need to be much higher per the
FC/CYA Levels.
I would be concerned about two things right now:
1 - The potential for algae which is why you can't hold chlorine; algae requires the
SLAM Process to kill & remove it.
2 - Accurate test results.
So let us know how you are testing and we'll go from there.