I agree with @Tinuva - It's pretty clear why HAM is trailing by 20 points. Most has had to do with luck but add the fact that HAM for the first half of the season was the guinea pig and carrying additional weight where RUS was the control and there's really nothing in it.
What you've heard on radio and broadcast feed is just a tiny fraction of the communication.
Hamilton was going for his 8th crown this year and very early in the season it was the RBR/Ferrari Show. Merc were nowhere.
It is highly doubltful Hamilton, a 7x WDC would allow his car to be a guinea pig while his new team mate was allowed to outscore him. If that's the belief, why has he not come out and said so? And if it isn't the case, then it's all conjecture and personal feelings about something that is very much unlikely.