Hi,
I think I would second what nik256 mentioned. You should consider what level of practice and preparation you have had for your GMAT sitting next week and then decide to claim the number of mocks accordingly. It is good that you have done the first two OG tests and the TTP diagnostic. Would be a good idea to save the other OG mocks for your next try in June if you know for sure you are going to retake it. Meanwhile, practice with the unofficial mocks as much as you want to feel comfortable. I am sure if you do the TTP's practice including the mission and global tests, they should be very helpful as well.
Good luck! Hope you will get a wonderful score and won't need to retake later