Okra easiest to germinate in DWC system

My experimental setup.

This is an DWC system. Currently have okra in it. I understand the light is very high and the left-hand side plant is leggy, those seeds were directly put into the hydroton. Need to lower the light.

The other two plants were transferred from other place. It was also leggy, but while transferring i burried most of the stem into the hydroton, and bcoz of that it seems normal.

From my experience till now, okra seems to be the easiest to germinate, all the seeds that I have popped in have germinated, whilst I have also tried chilly and spinach, literally zero seeds have germinated.