Aha, okay. Then I would send the 'coming in' flight and maybe upload a remark sheet for the return flight with 'want year extension' or so. Bit strange for me they ask also a return flight with a non imm. O.
If it's a one time thing I just would use the Bangkok bank app. Yes, maybe it cost a bit more, but otherwise you have to use an app like Deemoney or so (Registration, setup, etc. etc.)
Not sure for 30 day extension. Always did year extensions.
The picture of you is one side of the STM2 form.
Other side is Acknowledgement for permanent stay so think that's not needed for sure. For Korat we also have a deposition form which you also not need.
Think the TM7 both sides is okay and maybe the overstay part which you showed.
What I read is that there not seems to be any limited entries of 2 times with exempt entry by land anymore as before. But.......as you can read by the OP after a couple of times you push y'r luck if they think/see y'r trying to live in Thailand by using those exempt entries.