I think the most important points that have been made are these;
1) MOST IMPORTANTLY....work SAFELY, follow the methods!
2) Communicate with your dispatcher! let your sup know as soon as you get there and see the day's workload that you will not be able to complete it in the time-frame they expect. Report any delays or anything unexpected that should come up that might take extra time as soon as it happens. They will always fall back on safety and communication. They will claim that if you had just told them that you were delayed they could have arranged to get you help(even if they were asking you if you could go help somebody else just a little while earlier, so help obviously wasnt gonna be available to you). Even though you aren't stealing time and are probably busting your ass every single day you are not gonna get the benefit of any doubt from these people. They are gonna know where the extra time went as it's happening. So assuming you are trying your best and not screwing around out there, you dont have much to worry about if you just take the time to cover yourself.
3)DONT EVER SIGN THESE WARNING LETTERS when you dont think you've done anything wrong. Even if you have done something terribly wrong, always have your steward, or better yet, your B.A. advising you. Signing this was the same as admitting to some kind of wrong-doing. What exactly are you supposed to prevent from "recurring"? Stealing time, thats what! SO signing is effectively the same as saying
"I'm sorry, I promise I will never steal time in the future". Notice how they went out of their way to ackknowlege, if not commend, your pick up and delivery methods?. In other words, any discrepency bewteen the projected time on-road and actual time on road can not be explained by simply a lack of training or experiece that resulted in innocent inefficiency on the part of someone who is really trying to do a good job. They included that line to take excuses away and support their assertion that the driver is deliberately taking too much time in an effort to accrue overtime hours. But if they they worded it that way they know you wouldnt sign it.