I need a Technogel cushion Deluxe, but the height of 17 or 14 cm comes into question. Since I can't try it out, there are parameters to assess this. So far, I've had a 14 cm cushion on my garden table, but now I have headaches more often in the morning. I don't know if this could be caused by the cushion. Can you give me a tip? Kind regards and many thanks in advance