I just returned from immigration at Laksi. As always in my case, no TM30 needed. In and out in under 1h.
I thought visa exempt extension can only be made at Laksi. Based on your feedback at CW, I'd recommend Laksi. Staff was friendly this time, including the document check 'chicks'.
It's probably better to not show any TM30 and try without it first. Once they saw your screenshot, they insisted on a correct one.