im surprised no one has said this yet...you're in essentially saudi arabia am i right? your temperatures will play a HUGE role. as well as the octane standards. as far as i know, saudia arabia, and most of the world uses a "RON" (research octane number) octane rating. the USA on the other hand uses an "AKI" (anti knock index).
a quick google search turns up our 91 in the USA is equivalent to the posted "95" octane in the rest of the world. which could very well explain your power differences. as well as the low humidity/high heat in that part of the region. but back to the octane ratings, it seems you're essentially putting in what us americans know as "87" into your Z. hence the lowered power ratings.
edit: wikipedia'd it:
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Bahrain: 91 and 95 (RON), standard in all petrol station in the country and advertised as (Jayyid) for Regular or 91 and (Mumtaz) for Premium or 95.
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