No this wasn’t what I planned to do, I wanted to start with the very simple algorithm, which is the one we currently have: the issuer of a block has temporary handicap, which depends of the number of previous issuers. So the more we have (member) nodes on the network, the more we have issuers, the longer is the handicap for each particular node.
Here, you can see the effects of the algorithm on less than 20 nodes. But have you considered what it looked like when we had 1 node? 2 nodes? 5, 9, 13? You will probably see a very different distribution, because changing of scale triggers new scale effects.
So here, you have to consider that Duniter only has less than 20 nodes on its network, compared to Bitcoin which has at least 10 times more nodes. The effects of Duniter algorithm are difficulty to see right now because the quantity of nodes is too low for now. A second thing is that Bitcoin miners can gather themselves in large mining pools, which is not possible in Duniter (or very improbable).
So finally my opinion is that it’s rather Bitcoin which, with its mining pool possibility, looks like a Duniter network of 20 nodes.
Edit:
Please note that we have thought to change the current rule to something like the one you expect for several months. I will try to make something for the next protocol version (0.4).