Advice on Letters of Recommendation
Since this is an "internal" application, the recommendation letters are really a formality.  The department wants to know whether you're likely to succeed in their program.  Since they already know you, they have a good idea what sort of student you are.

In my opinion, your real problem is that they know that you're that type of student who bites off more than he can chew.  That sort of student is not likely to be successful.  (I don't know why, but that sort of student annoys me deeply.  It pushes some button deep in my psyche.)  You expend lots of effort but you don't master anything.  All these graduate profs have had you sitting in their classes, thereby soaking up some of their effort and for no results.  Meanwhile you dogged your undergrad classes, and wasted the efforts of those professors.  

My advice, if you want to get into their program, is to go on a mission to convince the faculty that you've learned your lesson, that you know you need to focus and master today's learning today.  That you won't, in the future, be distracted by every shiny object that arises.  Yes, lots of different bits of mathematics are interesting to the point of being seductive, but you can't learn them all at once.  The moral of the story is that joke about the old bull and the young bull looking down the hill at a herd of cows.