Just for your information, boosting the antenna power beyond what it's possibly capable of can be a bad idea. And I'll tell you why.
First off, the wireless portion if boosted can cause re-transmits of data, and even cause more errors over wireless. It's not necessarily better in that case. Boosting it higher out of spec can cause hardware degradation and so forth.
Second, 9 times out of 10, adjusting antennas properly can increase signal greatly.
Third, just because you put it on 5 GHz, doesn't mean that your signal is going to be fantastic. It can degrade with 5 GHz devices nearby. Setting it for only 40 Hz width isn't going to do much for you either. Think about wireless networks overlapping as well, and how other networks around you might interfere. Even phones too.
Fourth, the OLED screen is off or in standby mode when not in use. Uses VERY little power in general. They are bright, and use much less power to display stuff.
The 2.4 GHz band is plenty. No need to go into the 5 GHz range, unless you got phones that low down that will overlap and cause problems. And 30 feet through one walls can be a lot. Do you know whats in that wall too? You can't expect full reception. Hope it helps.