First time posting.. Any suggestions would be greatly appreciated !!

16x32 in-ground pool
approx 23,000 gallons. deep end 8ft low end 4ft
sand filter
1.5 hp pump hayward

I believe the pool was closed slightly green.
current readings:
TC 3.7
FC 0
PH 7.2
TA 80
CH 200
Stabilizer 60

When we took the cover off about three weeks ago the water was dark green. We used about 5 bags of powdered shock from Sams Club and it had little affect. Over the next couple of days we continued to shock the pool with no noticeable difference. we have never been able to get a FC reading higher then .5. We've tested the water at home using test strips (sorry about that) and have brought the water to a local pool place as well as Leslie pools. On the advice of Leslie Pools we added Green out and when that didn't work Pool First Aid with again no change.
I discovered this forum and switched from powdered shock to liquid chlorine, first using 6% and then purchasing from the pool place 12.5%.
The first night I added 6 jugs (96oz each) of 6% and had no FC reading in the morning
the second night I added the 5 gallon jug of 12.5% and as of this morning still no FC reading on our test strip.

The water is no longer dark green but cloudy with a green tinge, you can see the bottom of the pool in the low end but not in the deep end.
How much liquid chlorine should I add at one time?

Thanks!!