Yes, 8 ppm. Higher than I would like. But, if that number is correct, I am not sure why it is that high. I would almost suggest you do a further dilution. The first two bars on the chart have no "purple." they are easy to discern. The bar at .50 is a light purple, after that the bars get harder to tell the difference. I mistrust your seeing 2 ppm. This is because early on you were reporting nitrite between 2 and 5 ppm. That is a wide gap. The bottom three bars on the nitrite test can look pretty similar. I could also be wrong and what you saw was correct. I need to be certain
Using a multiplying factor of 4 also multiplies the effect of a misread. If the actual nitrite level is only .5 ppm different to what you thought the test showed, that translates to a 2 ppm error. Depending if the .5 error was over or under, the result could mean 10 or 6 and not 8. Even the third bar down from the top is nowhere near as dark as the next three.
So, lets try this. 1 ounce of tank water and 7 ounces distilled and see what color you get. This is basically an 8 times factor. If you are reading 2 ppm correctly, this test should be close to the color of the .25 bar. I assume you will do this tonight because, hopefully, by tomorrow morning nitrite will be lower. You should have 122 ounces of distilled left from the gallon.
Here is the thing about the process you are going through. If nitrite goes over roughly 16.5 ppm on your total ion kit (which stops at 5), it stalls the cycle. That means the ammonia bacteria have problems. And if that is the case, they stop processing ammonia, or at least slow way down. We also know you had, and still have, some amount of nitrite bacteria because of the nitrate present. When you did the big water change to reset thing, you also lowered nitrate levels. They have come back up since then and there is only one way for that to have happened.
Things are moving in the right direction for sure. All we need to know is a real nitrite level and the direction in which it is moving. Somewhere along the way I managed to learn how to do this all for my tanks using only the ammonia kit. But that assumes I know when things started, how much ammonia went in when, and how fast it is testing 0 afterwards. But I also seed tanks/filters with bottled bacteria and/or filter squeezings and other things from my other established tanks.
Using a multiplying factor of 4 also multiplies the effect of a misread. If the actual nitrite level is only .5 ppm different to what you thought the test showed, that translates to a 2 ppm error. Depending if the .5 error was over or under, the result could mean 10 or 6 and not 8. Even the third bar down from the top is nowhere near as dark as the next three.
So, lets try this. 1 ounce of tank water and 7 ounces distilled and see what color you get. This is basically an 8 times factor. If you are reading 2 ppm correctly, this test should be close to the color of the .25 bar. I assume you will do this tonight because, hopefully, by tomorrow morning nitrite will be lower. You should have 122 ounces of distilled left from the gallon.

Here is the thing about the process you are going through. If nitrite goes over roughly 16.5 ppm on your total ion kit (which stops at 5), it stalls the cycle. That means the ammonia bacteria have problems. And if that is the case, they stop processing ammonia, or at least slow way down. We also know you had, and still have, some amount of nitrite bacteria because of the nitrate present. When you did the big water change to reset thing, you also lowered nitrate levels. They have come back up since then and there is only one way for that to have happened.
Things are moving in the right direction for sure. All we need to know is a real nitrite level and the direction in which it is moving. Somewhere along the way I managed to learn how to do this all for my tanks using only the ammonia kit. But that assumes I know when things started, how much ammonia went in when, and how fast it is testing 0 afterwards. But I also seed tanks/filters with bottled bacteria and/or filter squeezings and other things from my other established tanks.