So the “weight over heels” cue is really one of those, not fully accurate cues because as you said, you’re definitely still keeping the “tripod foot” thing going on it’s just that in my experience, cuing a good morning squatter to “stay on their heels” will actually just put them back into the more proper, 80% of load on heels, 20% on toes sort of position. It also seems to cue them to push back into the bar more with their upper body.
The two biggest things that helped me break out of a good morning squat habit were intentionally opening the hips to give the torso somewhere to go at the bottom, and getting the grip and bar placement set up to make driving elbows forward and “pressing” the weight back out of the hole occur naturally.
Getting you hips open will let you sit a bit more upright at the bottom. I’ve seen a lot of guys sort of fold over a bit at the bottom to be able to hit depth, which sets you up for a good morning squat even if you’re able to keep your spine neutral. Now, if someone has a real short torso this might not be terrible, but I still think it’s probably less than optimal. If anything, driving your hips open has a secondary effect of building tons of tension in your lower body, which will help when you have to reverse direction and start pressing into the floor.
With the upper body positioning stuff, it all boils down to preventing the elbows from popping up as you come out of the hole. When the elbows raise, it causes the whole upper back to roll forward and if you’re gripping the bar tight, the bar can roll as well (even if only very slightly). This creates a huge torque that you must now fight against in addition to just raising the weight. What I like to see is a lifter developing a setup that gets their elbows wedged under the bar and makes for driving the elbows forward and pushing the weight back with your hands out of the hole a more natural, intuitive feeling. Using a thumbless grip and even slightly rotating my palms out a bit has helped me a ton. Obviously shoulder mobility will play a big role in this, but I would rather see someone widen their grip or place the bar a bit higher on their back if it lets them utilize this “elbow drive” technique. What good is a super low bar position if it’s almost impossible to keep the bar from rolling right up your back? What good is getting your upper back tight with a super narrow tight grip if out of the hole you press yourself forward with sky-high elbows and fold in half?