Weak iphone/android Wifi signal in rooms, APs in hallway

Hi...
I am struggling with weak signal coverage inside rooms where APs are hung on the outer walls of the rooms i.e. on the hallway, one the sides, not on the cieling. Laptops work fine but mobile devices (iphones, androids, ipads) suffer the most. The hallaway is approximately 30m long, having 4 large rooms, two on either side of the hallway. The walls are made up of cinder blocks with concrete pillars. We have installed 4 2602 APsin the hallway, each with 4 external antennas, in an alternate fashion, i.e. first AP on the left side of the hallway, second on the right, third again on the left, fouth on the right again. The APs are approximately 4m apart.
We are using
WLC 5508 7.4.100.0
Cisco 2602 APs with 4 external antennas
I have read the Cisco document of Best practices for Apple devices and enabled all 'n' data rates. That helped a little bit but I know we can get better coverage. I am suspecting that RRM is reducing the Tx power levels since the APs are all in the line of site.
I have to admit that a precise site survey was not performed but I hope to get some advice on tweaking the Tx levels in my scenario.
I am attaching 2 screen shots of the hallway APs (circled) in b/g/n and a/n showing the Transmit levels. I have tweaked one AP tx level only (circled, changed form 4 to 3 under a/n) but didnt get the time to see the results.
All help is appreciated

Thanks for the replies,
Leo,
I have tried to convince our people to place the APs inside, but they rejected this based on health concerns. I tried to dig up something from the internet to alleviate their fears but was not successful. The view of four antennas is what scares them most. Maybe I will remove the antennas and then try to convince them again.
Scott,
You have mentioned to position the external antennas in a vertical fashion. We have 4 per AP. Shall I point all the four in vertical upward direction or the top two upwards and the bottom two downwards? Just to remind you again that our APs are not mounted on the ceiling but on the side walls of the hallway.
I will force the Tx levels to 2 on all the 4 APs and hope interference will not degrade performance further.
Thanks again

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~~~~~~~~~~~~~~~
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