The data was posted earlier, but isn't posted on the site anymore because the calculations it took were too extensive for the free server. And the data were too noisy for all the levels besides 4, 5 & 6 to get useful/reliable data out of it anyway. So unfortunately I can't provide any of what you're asking for. However, if you project those differences out (that's my guess for how it works) you get something like 14 pops for a lvl7, 13 for a lvl 6 and so on until 8 for a minimal trainer. So the effectiveness grows linearly while the cost grows exponentially.