My toaster oven reflows perfectly with the temp around 205-210degC for 4min. (temp from fluke thermoprobe poked into oven)
Also, check the heating elements in your oven. If they are glowing red then they are emitting lots of IR which will scorch things. You want them to be just under glowing. If you can't get the temp you need without red elements then you need more elements.
Usually a toaster oven with elements top and bottom are fine for getting to 210C without any element glow.
Single sided ovens maybe different.
You don't want to use the ovens built in thermostat. Its too slow, it will get red hot for a while, then switch off for a while.
You want a solid state control system or a variac