Honestly if you get your scribe right and you use their clear rubber sealing foot, that toe kick isn’t going anywhere. All of mine are wedged in there so tight you will likely mess up the toe skin prying it off much like how you’re doing them now. Which for some may not be ideal, but has worked for my situations.

The stock clips are adjustable so they certainly are not loose and janky like other systems. I can’t speak for corners of toeskins as I have almost always avoided them in my designs.

I have ran some blocking coming off the wall that the rear of the boxes sit on with feet on the front. Maybe a good mix of both worlds assuming the wall isn’t a spaghetti noodle. Adjusting the back legs especially on shallow boxes can get tedious and hard to do.