I personally wouldnt recommend using (Facing 6) 6689 if (and probably only if) your using arrow keys to move. I use arrow keys and everytime I try to do it by using 6689, i end up dashing upwards since ultimately, im pressing 88 twice (cuz im using *right, right up, (up and right)*.
(if you need more clarification on what I mean by ^this, [Since I'm not sure if i communicated properly], then just pm me, ill be happy to explain what i mean further)
If your using numpad this probably wouldn't be a problem but with arrows its a pain. If your using arrows, i suggest you just use the traditional halfstep move, so 6649. And so on so forth for all the other directions.