After checking my technique and springing for a LaMotte test kit, I am getting the following readings:
Hanna Checker: 8.9 dKH
LaMotte: 10.64 dKH
Red Sea: 10 dKH
These readings would seem to be within a reasonable margin of error for hobby test kits. If averaged, I get about 9.8 dKH which is just fine. I consider the problem solved and really appreciate the suggestions form the veterans on this thread. Thanks again!
