As far as the PATL during the Lottery....
Not listing one is definitely risky. A lot of life can happen in the 1-1.5 years of waiting if you are awarded a trip. We had two people cancel on us for health reasons within a couple weeks of the trips. If they had been the TL the trip would have been canceled.
That said.....each time I have gotten a permit it has been when someone chose to not list a PATL and run with the extra points of newcomers. Those five points per person seem to help.
As far as listing on the same day.....don't understand the mechanics of the lottery to know how to run the stats but I would guess that is close to accurate. I am guessing if you are trying to enter the main lottery and applying for "best dates" that bombarding one day could help but that the margin you gain is going to be minimal. I have never applied for a main lottery just follow-up ones.
One other strategy is deciding between small or large trip........