What can I do to avoid lasting gridlines from ablative Sciton profractional?

I will be getting profractional and I'm wondering if going deeper or less deep will lower the likelihood of having long lasting grid lines from the procedure. Is there anything else that can prevent this? It seems the main negative side effect of this treatment is the lines, I've seen people saying they were stuck with them for months or even years. I will not be able to afford a 2nd treatment of lasers so I need to get this right the first time.