Hello Shohrat,
Did you yourself convert your GPA into US scale or used any agency like WES, ECE etc. to do so? If you did it yourself, then maybe try getting it converted from ECE.
However, some B schools do not require GPA conversion for international students. No school asked me for US scale GPA when I applied back in 2012. However, for MS programs they require US scale GPA.
I think you bring good diverse experience. In my opinion MBA admissions teams do not see many applications from Turkmenistan. So play your diversity card right. Also try and improve your GMAT score by focusing on your quant at least.
As per schools. Rice University is known for Energy/Oil. UT Austin, Texas A&M, UT Dallas, SMU Cox and Texas A&M are good schools (In no particular order, but UT Austin is the best in Texas and highly ranked).
Hope it helps,
Good Luck!
Ayon
(P.S - I designed a part of the mobile network for Altyn Asyr (TM Cell) back in 2012)