Ending on familiar ground helps you allocate the time. The last thing you do before your delivery of the 1AR is to count the number of issues you will be covering. This will give you a sense of how much time you can spend on each argument. Have your partner help you keep track of time. You may be able to grant a negative solvency argument in order to evade the link to a disad.
Negatives often run disads with contradictory theses.
You can grant one disad to prevent another. For example, if you are going to grant out one solvency arguments to evade a disad, make sure you have another solvency mechanism left to gain an advantage. Remember, the 1AR has to speak quickly and use good word economy because the 1AR has only a few minutes to answer the entire negative block.