The pressures depend partly on the weight of the car and the suspension tuning. Since the sedan and coupes have different weights and suspension tunings you can't really carry them over directly, but using the sedan pressures for the 19 inch wheels is probably a good way to go. As you can see from the pic above, the pressures for 19 and 19/20 on the coupe are the same. Based on the coupe's pressures with 44f/39r you are currently running the high speed normal load pressures. Those are meant to keep the tire deflection in check at speeds over 155 mph, so they don't overheat, but at lower speeds isn't really an ideal pressure. For speeds up to 155 mph you would run the normal load lower speed pressures of 33f/32r, or 36f/36r for a fully loaded car. So anywhere between those two is essentially where you wanna be, but again, you are probably better off taking the respective pressures from the sedan sticker.

For clarity, on US roads and summer performance tires the tire pressures you wanna use are the following. The others are not relevant. You likely won't be driving above 155 mph on public roads, and on a track you'd use different tire pressures anyway, because the tires get hotter from cornering, so generally you'd dial it in such that the hot pressure is around the normal load cold pressure, but ideally you'd use a temperature gun and adjust the tire pressure until the temperature is the same across the entire cross section of the tire. If the temp is lower in the center than the edges, the tire pressure needs to be raised, and if it's hotter in the center than the edges it needs to be lowered until the temps are even. You can do the same for the road, but that's a bit of a hassle, hence the recommendations on the fuel door sticker.

EDIT: Also keep in mind that if you drove around for a while with high pressures like that, the tread depth in the center of your tire is likely lower, so if you lower the tire pressure now, you still won't have a good contact patch until wear has evened out again.