I'm not even sure where to begin with all this.
So, there was an error from a previous day. Ok. But, your idea of correcting it is to fudge the numbers for the current day to account for it, with no indication of what you are doing? Really? It would seem like basic common sense would suggest that you would want to (1) Indicate that you are correcting a previous error, and (2) State the corrected total first, then provide an accurate summary of the current day.
Now, your approach would be confusing enough if you could do the math correctly and actually apply the proper adjustment. But you can't.
No, it doesn't. For starters, the difference between the two amounts was 1.81, not 1.6. Secondly, the difference between your Milwaukee bet plus a 1 unit correction is 1.23 units, which does not equal 1.6. Nor does it equal the actual correct number of 1.81. So no, your results are not accurate.
Then again...
If you are using the +/-1 is close enough philosophy of math, then I guess all of the above actually is correct. I mean, -8.2 + 1 does in fact equal -6.2 ..... +/-1.
If that's your idea of accurate math, then: (1) Yes, use a spreadsheet. It will do actual correct math for you, and hopefully save you a lot of grief. (2) Like i said before, how it could possibly surprise you that people are skeptical of your posted results is beyond me.