With the very most of respect to the knowledgeable folks here, I'm actually just looking for help with next steps and not start a discussion/debate about the accuracy of different types of test kits.
To work towards that end though and to (hopefully) satisfy that my test kit is producing accurate results, let me clarify what I'm using and a few things about it.
I am using an eXact iDip® Smart Photometer. The method it uses is you take pool water samples, and rather than putting liquid reagent into the samples like the Taylor kits, the reagent is taken off a factory manufactured test strip with an exact amount of reagent on the strip. The reagent mixes with the pool water sample (of a very specific and measured size), and then the photometer digitally reads the colour of the resulting water, and produces a reading. The device is capable of measuring all the required pool water measurements and also can be used for other measurements for Spas, well-water testing, aquarium water testing and even beer production. You simply buy the additional required tests and reagent strips.
In terms of accuracy... don't take my word for it... the NSF which is an independent testing body since 1944, has specific levels of certification in place for this type of test called NSF-50 (for example free chlorine and pH in Pool water, a separate standard for Spa water, etc. These certifications for helping ensure public safety in swimming pools, spas etc.)
Based on these certification levels, testing kits can score Levels 1,2,3 (L1,L2,L3) with L1 being the most accurate, L2 the next best, then L3 certification.
The full list of products currently certified by NSF for Pool and Spa water testing are listed here:
info.nsf.org
As you can see on that list, the Taylor Technologies kit that is promoted here (and I don't doubt it is excellent), the K-2006 and K-2006C, are certified by NSF at L2 or Level 2 for total chlorine and also for free chlorine in pools. It is certified at L3 for CYA and pH. What this means specifically for FC and CC is that L2 accuracy is within +/- 1.0 ppm for readings between 3 and 5, and it is accurate within +/- 2.5 ppm for readings between 5 and 10.
The iDip kit which I am using, which I have seen being dismissed on these forums as "not good enough" as all digital kits seem to be "lumped in together" as inaccurate, is actually certified by NSF as Level 1 (L1) for Free Chlorine and pH, and L2 for combined chlorine and CYA. Both more accurate than the Taylor kit. This L1 certification means for accuracy for FC, it is accurate within +/- 0.2 ppp for readings form 0-3, within +/- 0.7 ppm for readings from 3-7, and within +/- 1.5 for readings from 7-10.
In summary: the same NSF independent testing body, established since 1944 and responsible for independently certifying products for health and safety around the world, has published that the iDip kit I'm using, is CERTIFIED as more accurate than the Taylor K-2006 and K-2006C kits.
Now one question that comes up is "what about calibration?"... don't those meters need to be calibrated? Yes, they need to be calibrated, but the product includes a standard colour test kit in the package that enables one to run a calibration test at any time to ensure the device is properly calibrated. I have run that test several times and it has given the exact same and correct calibration reading, exact to the 0.01 ppm on the test every time I have run it.
With all that said, I submit that I'm personally confident in the accuracy of the device. Perhaps I am wrong and I will admit I am not an expert, and do defer to the experience in these forms, but to me the science and process used by NSF has to mean something and they certainly are also experts in the field I'm relying on.
The exact iDip product I'm using is designed and manufactured right in Rock Hill, SC in the USA and the company has won numerous awards and has been established since 1989 and has industry leading water testing products.
Sorry for the long explanation and honestly I hoped to avoid a discussion about whether my test kit is accurate or not, but for the sake of next steps would it be possible to just take a leap of faith and assume the results are accurate? If they are, then based on my initial questions I'd really like to get some help with next steps.
You did mention that with the test kits that are promoted here, one would never get results like I got. I'd be interested for some clarification on that, and also with guidance on next steps if possible.
Thanks!