Looks like we both doing the same thing, attached is my corrected version
I have tested this with NTSC output from RPi and it switches and displays correctly.
I have moved the text, also the RPM and NTSC so that it only appears when there is incoming video.
Regarding the text size I think you will have to play with the POSITION REGISTER - never tried that but that should do something. The STV data sheet does not give much idea as to what that does !
Use my hex file and see if it works on yours.
Should have changed the file name - memory lapse.
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