set table $DATABLOCK1 plot <file> using 1:2:3:4:($5+$6):(func($7)):8:9:10 with table
Because there is no actual plot style in this case the columns do not correspond to specific axes. Therefore xrange, yrange, etc are ignored.
If a using term evaluates to a string, the string is tabulated. Numerical data is always written with format %g. If you want some other format use sprintf or gprintf to create a formatted string.
plot <file> using ("File 1"):1:2:3 with table plot <file> using (sprintf("%4.2f",$1)) : (sprintf("%4.2f",$3)) with table