I have... and others have had success with the same pistol. Its me.
Grip angle?
Oh well... Like you said, not bad grouping for the short model 30
Like I said, the Glock's wide ass promotes heeling. The grip angle and frame geometry are so unique to Glocks that people associate it with the gun shooting high. The fact is, the same thing that causes down and to the left on a right handed shooter will cause heeling with the Glock.
I did the same thing when I bought my 17L. It took a little time and effort to work it out.
Stick with it, pay attention to what you are doing, and try your damndest to not move at all. Let your trigger finger do all the work, and ONLY your finger. Just focus on squeezing that trigger.