If I sell an unencumbered nonexempt asset, do the creditors receive the appreciation or do I?

I'm in a 5 year chapter 13 plan. My applicable commitment period is three years. I opted to extend to five years to pay for nonexempt assets. I have a lawyer who is non responsive. I am currently over 3 years into the plan. I would like to sell the asset, pay creditors the nonexempt value (value set at time of filing) and use the excess proceeds (appreciation acquired during the last 3+ years) to pay off my plan. Nonexempt assets at time of filing is $24,500. Property to be sold valued at $11,500 at time of filing. Sale price is now $25,000. Is this allowed or not? Does appreciation of an asset sold after the "applicable commitment period" go to the debtor or the estate? Again, I have an attorney who will not respond. I have contacted other attorneys who will not take over my case because it is messed up, and they do not want to be responsible for my attorney's mistakes. Yes, I know. I can dismiss this case and file a new one. I can hire a new attorney at any time. However, dismissal of this case, through no fault of my own, requires an even longer waiting period to get a new mortgage. The point of this filing was to catch up on arrears. However, my attorney (actually some young paralegal he pawned the case off on) miscalculated my payment by about $50,000, so I surrendered my house, based on false calculations. File a malpractice suit? Not going to happen. No lawyer around here will consider it. They all said I would have to go out of state to find an attorney willing to sue another attorney. I have been in my lawyer’s office, asked him a question, sat there and watched as he called the trustee's office to see if he could do what I asked. Aren't lawyers supposed to know what they can and can't do without calling the trustee? To me, that's like defense council calling up the prosecutor to get permission. It makes no sense.