For an automatic; I'm with you on this.
except with a 4 speed car;
For these,I delay the all-in to 3000 to 3400, depending on the cylinder pressure.
54 to 56 is a pretty good cruise-timing number.
But the full-timing so early in a hi-compression manual trans car, gets too jumpy for me in first gear,with numbers that high.
Conversely; with a dead cold engine, at say @68*F, she likes a lotta idle timing, like 22/25 . it seems to take a lotta lotta time to heat all that aluminum up.