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Rnd 6 and 7 corners- changes made.
Rnd 6
(ch2, dc in ch-2 sp, ch2, {dc, ch1, dc, ch1, dc} all in next ch-1 sp, ch2, dc in next ch-2 sp, ch2)
Rnd 7
(ch1, dc in ch-2 sp, ch1, dc in next ch-2 sp, ch1, 2 dc in ch-1 sp, ch2, 2dc in next ch-1 sp , ch1, dc in ch-2 sp, ch1, dc in next ch-2 sp, ch 1)

May need to use different hook size to get 6” with other worsted weight yarn.