1. First of all, there is no math formula for the DP. Moreover, there is no even standard criterion for the DP optimization. As so far, we use Success rate,% which is proportional to the sum of 'successful probabilities', i.e. computed probabilities of actual outcomes of past games. We continue research in this direction - look at spreadsheet with several criteria for the best DP in different leagues (I am not going to comment its content at current stage of research, please don't ask!). The task is quite hard because behaviour of curves may be different in different leagues.
2. There is no sense to examine other algorithms than that of 2015. It is implied that the latter is the best.
3. In Performance analysis tool, we'll add ability to change DP, and some second criterion in addition to 'Success rate'.
Thanks for attention to this important issue!