In Shacharit, we say Korban HaTamid in the Korbanot section, as a way for us to "bring" the Tamid offering which we no longer can bring without the Beit HaMikdash. However, the Tamid was brought twice a day during the days of the Beit HaMikdash. Therefore, it would make sense for us to say the Parsha twice, once for each time we bring the daily offering.
So, why is Tamid not a part of the Mincha service?
Should one say it twice a day, with the Yehi Ratzons?
Are there any sources that one should say this twice a day?