Mock-ups

I change the seat from rectangle to trapezium shape with the long edge and smaller to the back side

Also add a stick between 2 front legs to help it not stretching and change the sharp point to flat 

Stacking

BUT, the changing makes the shape goes too far from the original idea that giving a visual triangle from any side of the stool.

Then, to go back to the original idea. a little bit change again

Keep the sharp point (or make it a very short flat) and move the point a bit further out