I would start with a single dose of 20 ppm, not 75 ppm. That's about 5 gallons of PLAIN 6% household bleach. You cannot keep using that trichlor + goop blend. True trichlor is 90% or more available chlorine. What every your CYA was BEFORE you added the trichlor, it's a lot more now.

Use bleach, and keep working up your chlorine level till it dies.

One HUGE caution: metals can turn a pool green. Slimey walls on a vinyl pool = algae. No slime? It might be something else. If you have orange iron dust on the bottom of the pool, it can make your water look green.

Check your filter: dead algae is tan; live algae is green; iron is orange or orange brown. If you have iron, instead of algae, you do NOT need huge chlorine doses.