Q. Why should not all private tefilos be said better at the end on Elokai Netzor?
Thank you

A. See above question 1536 on the reasons why we add personal requests and tefilos in the middle brochos of the amida. However, Mishna Berura (122: 8) writes that it is better to maintain the added tefilos on all matters one needs at the end of shemone essrei and not on shomea tefila. This is for the purpose of being able to answer kedusha or kadish when needed, after saying the yehi ratzon.
Horav Shlomo Miller’s Shlit’a was also mentioned in the above question.

Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit’a