That looks like a Kalk overdose not an Alk. Either way the pH is on the high side but if it's settling down, I would say caulk it up as a lesson learned. Let the Alk come down also. pH will probably drop over night too. This is why my Alk and ATO dosers are set up on the Apex with this final code after the dose times. "If pH >8.30 then off". If you do not have a controller get some digital timers.