If you already are. that's what I've changed but only the palettes aimed at 1A load . with 1b, 1c, 1d etc there are problems because you have to enter the menu so that they can carry. , I think I've already said.
Close, it is only 1X 01 00 00. Only the lower half (the right half, the part with the lowest value) is applicable. That is the palette slot in the palette viewer that the OW will load it's palette into and then use.
That is for a different issue. You litterally just need to hex edit the byte that controls where the palette is loaded to. That is in JPAN's manual, written out very clearly in the overworld section. Look for the picture of the bad player sprite.