You answered your own question. Be patient. Essentially you’re getting over-excited and rushing things which turns into pushing. “Let the race come to you”.
Well, the reason this never happens to me in the 200/400 is because I come out of the blocks slower. It’s not ideal, but I do it to make sure I get into my stride properly
essentially I have two block start mentalities - “conservative”, which I use for 200s and 400s, where I am completely relaxed and I “let the race come to me”. This is definitely slower than the approach I have towards the 55/100 which is more “explosive” and forced. The explosive approach is like playing russian roulette, if it works I come out of the blocks much better (6.92 FAT 55m in practice), if it doesn’t work I encounter the problem I described above.
So I guess my problem with the relaxed, let it come to me approach is that my starts are always .1-.2 slower over 55m than they are when I deliberately try to explode out of the blocks…though that only works less than half the time
at the end of the day i’m not too worried about it because it shouldn’t effect my main event, the 400, too significantly.