I don't check salinity or temperature just temp acclimate 10 minutes then poor a coffee cup of tank water in bag wait 10 more minutes then dump. I am not as old as your tank but I haven't lost any fish this way either.I'm with you a 100%! I do the same routine every time I get any fish as per what you've already been doing for centuries
I setup a quarantine/observation tank with some tuffa and crushed coral from my last tank. I fiquered the fish would like it better than a PVC pipe.All those must have been better than tuffa rock we used to use Paul.