pH of 7.7 is still in the safe range of 7.2-7.8, so you needn't worry.
A chlorine level of 5.5 could be too low, high, or just right. How did you get that reading? Is it an FC reading or a TC reading? (Free Chlorine vs Total Chlorine)
The key to the right chlorine level is the stabilizer level, for shorthand, CYA (Cyanuric Acid). If you look at our sister site, Poolsolutions.com, you'll see something called a "best guess table". This gives ideal chlorine ranges for various CYA ranges, for both maintenance and for shocking. The higher the CYA, the more chlorine you need.
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