FL/PE1 - stuck

I am not sure if I'm bending too much, or if it's alright. I feel stuck at 4x36 step where I can do only about 132 / 144 seconds (improved only by a couple of seconds during several weeks).

Any tips how to get past this?

Thanks.

You can reduce your back height to the point that your shoulder blades are just off the mat and pull your knees slightly closer to you. These adjustments might help a bit but you are still improving which is good! Mastering this is well worth the time.