I chose this data since BBB KO games are high level games, played at 12 TS / same attitude since s34 and does not suffer from HCA influence. I think this is the best data available to analyze. Indeed GDP influence the output data, but this is also a present reality of BB : you have way more chances to be predicted inside.
This data should be compared to England first division data to be validated since the number of occurences of some tactics are low and uncertainties about them are probably high. I will try to find some interesting outside offense BBB round robin games to add to the database in order to reduce these uncertainties.
I just want to share an idea, not so sure how good/bad it is but I'm confident you and Lemonshine can :-)
do you think it could be useful taking a new set of data from games bewteen BOT teams only? It is true that there is the HCA influence, but you will have a huge set of data, and the low level of the players can give you minimal variance from the medium values.
I don't know if there are series made of BOT teams only. You can also use only data from matches with few points of difference in the final result. And these data can be a sort of "reference" for % values of interesting parameters.