Aquasol HV emulsion with hardener for long runs.
Either don't use reg marks, put them high and low enough on screen to miss the squeegee/flood, or
register your screens, clean over the reg marks, and tape on the squeegee side of the screen.
You are printing the white last, yes? Looks like too much pressure as you guessed, there's a balance for
not squeezing out and still getting good penetration. Water will help.