newby help

[airscapes]

De-lamination has always been printing too cold, at least for me. Try 225. Just because you have your hot end set to 225 does not mean it actually is.
Sorry about the inaccurate size naming.. The square is actually 16.2x16.2 the inside is 15x15.
Your major difference is something mechanical or firmware related but beyond my knowledge. My squares measure 16.10x16.12, but I would use a solid model for that kind of measuring. This is just to set starting height and extrude multiplier.