You could call the law firm and negotiate a settlement. Most governments will turn over unpaid tickets to a collection agency / law firm in the hope that a certain percentage of the lost funds can be collected. Under certain circumstances your failure to resolve the matter could result in a lawsuit or it could negatively affect your credit history.
The incorrect information on the ticket can be amended at any time by the prosecutor. In and of itself it would not cause a dismissal. Officers do not have to have their running lights on in that situation.
Defending DUI charges is a specialized area of the law. You should concentrate your search for the best lawyer on those who limit the majority of their practice to DUI defense. Ask a few Non-DUI attorneys who would they hire. When you receive one referral's name mentioned several times, that may be the right attorney.
If you end up pleading to any "moving violation", whether the original charge or a moving violation offered during plea negotiations, your driving privileges will automatically be re-suspended once the court notifies DMV of the outcome. Many prosecutors will offer a non-moving violation if you have already reinstated your license.
You should ask them to write the letters in draft form without suggesting what they should write. Otherwise, it will be apparent to the Judge that they were instructed what to say as they all will look the same. You can edit out anything that you do not feel comfortable with. I don't think they should mention anything about you history together surrounding alcohol. They can mention that in their experience this event seemed out of character, you are usually a responsible person, you learned...
The law requires that the prosecution be able to show the jury that you could have placed the vehicle in motion with little effort. If you were driving an automatic vs. a manual transmission it would help your argument that you were not in actual physical control.
There may be a mandatory jail sentence but you will need to provide a little more information about the prior offenses, including whether they were in Colorado and the issuing state of you driver's license at the time of arrests. While the statute indicates a minimum mandatory 60 days, in rare instances that provision has been overlooked. You should talk to an attorney who dedicates all or a large percentage of his/her practice to defending DUI cases.
The Colorado State Public Defender system is one of the best in the country. They have many high quality attorneys. No attorney could tell you the probable outcome in the case without first reviewing all of the documents and determining the Judge, prosecutor, and government witnesses. Additional research would have to be done on the test results.