Oh dear Simon
You say "that ducati did not change from 2007 to 2011".
Are you sure that's correct? I'm pretty damn sure that the 2007 and 2008 Ducati had a steel trellis frame, whereas the 2009, 2010, 2011 (up until Aragon or similar) had a carbon fibre monocoque chassis. That's quite a massive difference, more of a revolution as opposed to an evolution. It also gained a carbon swingarm between 2007 and 2008, but i'm not sure exactly when. There were probably also changes to electronics packages and engine internals.
You are quite right though, Rossi fans do keep contradicting themselves on this whole development issue.
As is well documented, Furusawa gave Rossi various chassis/engine options to evaluate and choose from back in 2004. Rossi, Burgess, and Furusawa worked together (critical word that) to develop the bike from there to what it was when Rossi left in 2010. Granted there will have been feedback given by multiple riders along the way; Rossi, Edwards, Lorenzo and the Yamaha test riders will all have been canvased for their opinion on the performance of the bike and it's subsequent upgrades, but the feedback of their number 1 rider (Rossi) will have had the most influence, so my view is that Rossi's feedback was vital in the evolution of the M1.
How it appears now (to me at least) is that Rossi and Burgess are providing the feedback to Preziosi, but for some reason they can't seem to quite get the package right for Rossi which gives him the confidence to push the front like he usually does (although Hayden and Barbera seem to be able to, but that's another matter). It could be all manner of things which are causing this, from chassis geometry to enginer position to chassis flexibility (and a heap of other things which are far too technical for me). It will come with time, and a lot of hard work. They also need a new in-house test team, Vito and Franco just aren't quick enough otherwise this problem would have been sorted along time ago.
Remember that this is Ducati's first foray in to twin-spar aluminium chassis development (I could be wrong on that, please don't crucify me if I am), and they will need to try lots of things to try and resolve the issues Rossi is having. How many collective years have Yamaha and Honda been developing these chassis? It's also worth noting that the other riders must be having the same issues, but it's impacting on their riding style less (and good on them). Let's not even begin to cloud the issue with the impact that electronics could have on chassis performance (Casey was blaming electroncs for the chatter issue he and Pedrosa experienced at Qatar).
What I found interesting about Qatar is that Rossi was able to lap faster at the end of the race than he was at the start, to me that means that the extra grip he has on new tyres is having a negative impact on the chassis setup and bike behaviour. For the situation to move forward, Rossi needs an updated chassis which responds differently at Jerez, and then at each round until the problem is cured. This is not necessarily an expensive take, just time consuming on the basis that the contracted riders are not allowed to test between races.
Now, is anyone still awake?