No offense, but your pool store gave you worthless numbers. I have no idea what they mean.
"Total Alkalinity >100" --is this below 200? It needs to be.
PH>7.2 -- is this below 7.8?
Cyanuric Acid>0 --is this 10, 30, 60, 100? each of these values has VERY different implications.
Total Hardness>300 -- is it less than 400? Less than 500? (the limit)
Total Chlorine>1 is it higher? Is it the same as Free chlorine?, etc.
Free Chlorine>1

Now let me assume that it should be this:

Total Alkalinity =100
PH=7.2
Cyanuric Acid=0
Total Hardness=300
Total Chlorine=1
Free Chlorine=1

TA is fine, pH is at the low end of good, but above the min of 6.9
CYA = 0--you should aim for 30-50ppm
TH is fine. Vinyl you can go from 0 to 500
TC, FC=1 with cloudy water? I'd shock it up to 10 to 15ppm and keep it there and see if the water clears, and if it drops rapidly, especially at night. In the daytime, with no CYA, it can be consumed in 15 minutes by UV rays.

Keep filtering 24/7 and backwash whenever the pressure rises. If it doesn't clear, on to plan B.