Salaam o 'alykum warahmatulahi wabarakatuh.
yeah i agree with you, masha Allaah atleast we researching and finding out more from each other alhamdulillah :).
referring to the ayah's you mentioned above i.e. (7:52) (6:114) (4:56) etc. these are true and i believe them too.
it mentions:
These are the communications of Allah which We recite to you with truth; then in what announcement would they believe after Allah and His communications? (45:6)
now referring to this, what our beloved Prophet Muhammad sal Allaahu alayhi wasalam said in no way contradicted the qur'an. hadhrat Aa'isha (r.a) even said that our beloved Prophet Muhammad sal Allaahu alayhi wasalam, was a walking qur'an, and obviously they would in no way do/act to the opposite of what the qur'an says because our beloved Prophet Muhammad sal Allaahu alayhi wasalam is a messenger from Allaah subhanahu wa ta'aala and the prophets of Allaah subhanahu wa ta'aala do not commit any sins at all, but they can make mistakes (this is to give people examples of what to do in situations - Allaah u a'lam.)
like you said, this did happen in surah abasa (chapter 80) when our beloved Prophet sal Allaahu alayhi wasalam:
(80:01) He frowned and turned away.
(click on the text to see the explanation of why that happened insha Allaah.)
Allaah subhanahu wa ta'aala says that they could have even revealed the qur'an on top of a mountain.
Had We sent down this Qur'an on a mountain, verily, thou wouldst have seen it humble itself and cleave asunder for fear of Allah. Such are the similitudes which We propound to men, that they may reflect. (59:21)
but instead, Allaah subhanahu wa ta'aala sent a messenger as an example to us so we would know how to lead our lives.
Verily in the messenger of Allah ye have a good example for him who looketh unto Allah and the Last Day, and remembereth Allah much (33:21)
from the ayah above, Allaah subhanahu wa ta'aala encourages us to follow the example of our beloved Prophet Muhammad sal Allaahu alayhi wasalam insha Allaah. if you look into the hadith, most will just give a deeper understanding of what the qur'an says.. none of the authentic hadith contradict the qur'an and if any hadith did contradict the qur'an, it wouldn't be counted as authentic because our beloved Prophet Muhammad sal Allaahu alayhi wasalam would never say anything against Allaah subhanahu wa ta'aala's command.
if Allaah subhanahu wa ta'aala's messenger did say a fake lie against Allaah subhanahu wa ta'aala:
[69:44] And if he had forged a false saying concerning Us,)
(45. We surely would have seized him by his right hand,)
(46. And then We certainly would have cut off Al-Watin* from him,)
(47. And none of you could have prevented it from him.)
(48. And verily, this is a Reminder for those who have Taqwa.)
* Ibn `Abbas said, "It (Al-Watin) refers to the artery of the heart, and it is the vein that is attached to the heart.''
does that help? please reply back if you have any more questions insha Allaah. :)
wa Salaam o 'alykum warahmatulahi wabarakatuh.