yeah temp way to high. I tend to go for 200-215.
It will vary with machine and environment.

Also how have you sliced it ?
Layers, shells infill etc. Sometimes parts of text can actually be too small for the slicer to work with and bits go missing. I make stamps to imprint clay and have to be careful what fonts and font settings I use in openscad.
And what program did you use to design it ?