Hello @ady, and welcome to the forum!
Although I don’t think you’ll use it, I think I’ll ask, because you’ll never know, so I guess you have disabled brush smoothing completely? If not, you should try it, it is found in the Tool Options Docker while you have the Freehand Brush Tool selected.
But beside that, if you are deeply involved in pixel art, then you should consider spending five bucks for @Suzuka’s SZK Pixel Art Suite. Very probably these $5 will be the best investment in pixel art you ever make/made:
Michelist