Not sure what type of shock you used but suggest go with liquid chlorine or cal-hypo (since you have a vinyl pool) to quickly raise your FC if needed. I would err on the high side of your target FC which for CYA of 70 is 5-10ppm so maybe go to the 8-10 range to rid yourself of any lingering algae.
Is it okay to use a glass measuring cup instead of plastic?In your volume pool, you really do not need to measure that precisely. Use a 1/4, 1/2, etc of the jug.
But if you insist on measuring, use plastic measuring tools. A 4 cup one is good. Should have one for acid and one for chlorine to be safe.