Having noticed that the ...

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Having noticed that the flowing water has a high pH which almost decreases the disinfection efficacy of chlorine. The higher pH, the lower disinfection of chlorine due to presence of hypochlorite ions which are less disinfection efficiency than hypochlorous acid so, I assume that you are dosing high amount of calcium hypochlorite.

I do recommend to reduce the pH of distributed water up to 7-7.5 then add disinfectants to minimize the biological growth on the inner wall of pipeline with taking in consideration the value of LSI, I am always keen to keep LSI in the range (+0.5 - +0.75) 

As mentioned before there are different factors affecting on the LSI such water specification (Hardness, Alkalinity, TDS and water temperature as well.