A few things:
If you can find the mpRVU for your location, and for the typical CPT codes, that will give you a pretty good idea for what malpractice insurance will cost. Since it is based on actual data, it is a bit dated, but premiums usually don't change that abruptly. In other words, you had better get at least the mpRVU added to the wRVU to determine the additional compensation that will be required.
Also, the more malpractice insurance you have, the more you will be sued for. Attorneys want that check from the insurer and to move on to the next case. 99% of cases eventually settle for the insurance limit or less. Even when the jury comes back with a humongous verdict, they want their cash then, not to spend three years battling it out in appellate court. They settle. Or even better, go after the deep pockets of the hospital. The one advantage of hospital or corporate employment is that there is a growing trend of the physician not even being named.