OK, so 225 won't hurt anything to answer that question, heck even 230. Water boils at 212 at standard temp, standard pressure, you added antifreeze and pressure, so it won't boil until WAYYYY over that.
Next, the engine will loosen up and generate less heat as you run it, so that will help coolant temp (which is already just fine) as well as having infinitely more airflow as you drive
Third, you can advance initial timing to 16 or so later (if you need it) and just adjust your total once the engine loosens up, that will also cool more it at idle.
I'd still ask Jay what he recommends for total.Fourth, the coating will significantly change underhood temps which will make every other part under there cooler than it is now
See where we are going, everything WILL get better once you get some time on it and let it talk to you
Finally, then you can see what it does sitting there idling all day, but honestly, it sounds like yours is doing fine for a fresh tight engine.
I would just recheck all your clamps after the recent heat cycle, check the oil level, and see what it does. As far as a passenger, I don't even think you need it, just have a cell phone and go 5 miles, then go 10, then 20, etc. I think the car is going to do what it needs to now.
You are a very sharp guy, but
you cannot predict what it will do, you have everything where it should be, now let the car talk to you on the road. If it overheats at speed, you have a radiator issue, if it overheats at stoplights, you adjust the things above.
Worst thing, if it dies....pull over, call home and have someone come get you. Although I doubt that will happen.
Time to get froggy and jump buddy
Bigger circles from home if you have to, and choose streets based on places to park and less traffic (if possible in Florida)