411A Is your ‘more or less’ a slightly ‘upslope’ runway or slightly ‘down slope’ runway; or alternatively is it that the rest of the world is more or less in line with the FAA?
Whilst my psychologist acquaintances may agree that most things are more or less; my physiologist friends confirm that when approaching an up-sloping runway (touchdown point lower than the remaining runway) pilots have the illusion that they are too high, thus fly a below optimum glide slope approach. The opposite is true for a down-slope runway.
Neither friends nor acquaintances have comment on your down slope take off, but from experience there is the danger that after take off with continuing down sloping ground there is inappropriate feeling of having excess altitude, this is fine until the next upslope.