I tested 4 alienware laptops with the gtx 1070 i7 7820hk, they stutter and have a lot of microfreezes in games especially noticeable in battlefield 1 when the rear of the laptops is raised, no stuttering when the laptops were flat. Like I said tested on 4 Alienware 17 R4 laptops all same configs, same issue. What happened to "Engineered to wreak Havoc" ?? this is a serious issue that dell/alienware has to take into consideration.
Send me a private message with the 4 service tags so I escalate this to engineering.
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any Chance you watched the Fan Speed during the four Tests? my Guess is the Fans don't spin properly when your Laptop is tilted. i noticed something similar with one of my older GPUs. i own an Area 51 where the Cards are mounted diagonally and the EVGA 980TI Card didn't like it at all.