There is absolutely nothing wrong with sanding the paint, even sanding between coats, i have seen plenty of show paint jobs that have sanding between every coat, the end result is deep crystal clear paint that looks like you could put your hand into it. Use very fine paper, i would start at around 1200 grit wet and dry to get the peel out then progress to 1500 then finish it off with 2000, use a little dishwashing liquid in the water with the 2000 to make it easier to sand.....