If breakthrough is what you are aiming for, maybe try using a comfortable eye mask, I use a folded organic cotton bandana. Sometimes I use ear plugs too, if I'm not in a completely quiet setting.

If entities are what you are looking for then you are likely going to come across them. But that might not the case. Breakthrough may be feelings, concepts and geometry.

I try to breakthrough in one breath. Have you ever seen the video of Iyengar (yogi) demonstrating how long he can inhale!? That inspired me to move away from from 2,3,4 toke method. I often won't remember my body exhaling

Alex Grey sold really cool eye masks with circular cut outs underneath for your eyes so you could open them while wearing the mask. He sold them at his MicroCosm gallery when it was still in NYC. I had the pleasure of seeing the Sacred Mirrors in person and it was mind blowing how large those oil pastels are.

Wish I had one of those eye masks.