Back for a moment to the original question:
"do you know of any book that covers developing a memory that's alread good but just untameable?"
If the memory is untameable why bother trying to tame it? You've already served as judge, jury, and executioner. Your memory is untameable.
One of the points that Mrs. Birkenbihl makes on the Memory Optimizer course is that reconstruction happens 400 to 2000 times faster than your conscious mind can think. Consider that your other-than-conscious faculties are processing in excess of 12,000,000 bits of information per second and delivering you only 77 bits/sec. The problem of "memory" or reconstruction can always be traced back to the inadequacies of the original construction.
Moreover, on this same point, you determined that your reconstructions are going to be that way (ad infinitum), so you are locked into your life sentence. The problem becomes that with each "failure" of your memory (or reconstruction of an unrelated fact) you re-affirm your sentence rather than pulling out with Mrs. B's brilliant concept of "Intelligent Gap Management."
I love the Mem Opt's overall concept, but I honestly believe that more good will come from IGM than almost anything else in the course. Consdier that there are no failures of memory. And everytime you do not reconstruct what you want, the onus is on you to move into IGM and improve the original construction.
Is that a lot of work? Maybe. It doesn't need to be, especially if you'd remove the sword dangling over your head everytime your mind does something you didn't want it to do.
Train a dog sometime and you'll know what I mean. Our new Golden Retriever is amazing at remembering everything she's learned. Trying to correct her behavior requires consistent follow-through. When her tendency is to repeat what doesn't work for me, it's not her fault, and she isn't broken. It's my problem and I have to go through the new construction process again.
Lovely in its simplicity. Your brain is just doing its job.
Do I know a book? Yes. The Memory Optimizer course manual and any good dog training manual.