Thank you very much for your interesting findings and for posting the related screenshots. They verify, that TRIM is really active within your P67 chipset Intel RAID0 array.
Since I have read somewhere else, that TRIM is only active within an Intel 6-series chipset RAID0, if the RAID array has been (re)created after having flashed a mainboard BIOS containing an intel RAID ROM version of the v11.6 series, here is my question:
Did you recreate the RAID0 array using the Intel RAID ROM Utility v11.6.x.xxxx or has the RAID array been created with an earlier ROM version?
If it should be the latter, which ROM version did you use?