Or they used the old Corral A delineation which was at 1:44:08 or faster for a HM (3:40 marathon equivalent). Can anyone below 1:44:08 POT chime in to say whether they ended up in s1 or s2?
I ran some math for you. I assume the difference between s1 and s2 will be about 3 minutes. So let's assume you start 1 min, 2 min, or 3 min behind your desired pacer team of 3:45 or 4:00.
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To read this, let's assume you're aiming for the 4 hr pacer and you start 2 min behind them. That would be the right hand chart in color green. I'm assuming a GPS distance of 26.4 miles, so they'll be doing a 9:05 min/mile. If you wanted to catch them within 1 mile, you'd need to do a 7:05 min/mile. If you wanted to catch them at 6 miles, you'd wanted to run an 8:45 min/mile.
Now let's compare those paces to your physiological paces based on the 1:49 HM.
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Your M Tempo under perfect conditions, fully trained, and a top 6% converter is 8:40 pace. Given your HM pace is 8:19, I'd really hesitate to tell you to go any faster than that to catch your pace group. I'd personally recommend not going any faster than 8:40 under ideal conditions. If you're running Dopey, then I'd be careful going much faster than a 8:50-9:00 min/mile to play catch up depending on how you treat the other races.
Just some data to mull over in your decision making process if you do decide to try and catch them.