Internet terrible on rMBP but fine on all other devices.

This may be long but only because I want you guys to understand exactly what my situation is.
I have 7 devices at home that use WiFi:
2x iPod Touch 5th Gens
1x iPod Touch 4th Gen
1x iPad 2
1x HP laptop from 2007
1x 15in rMBP
1x 13in rMBP
EVERY device works perfectly fine other than those two rMBP's, they load web pages instantly, flash player works like a charm (on the HP laptop, since iOS doesn't do flash) and I have no complaints.
These two Macbook Pros however decide to be pissy little laptops, they don't load web pages fully, refuse to play any flash other than on YouTube which means websites like Hulu are dead to me and they sometimes refuse to load websites at all.
All this and they always seem to be at 4 bars on the WiFi icon at the top. Before you guys call out the hardware, keep in mind that the 15in rMBP went through a motherboard and airport card exchange at the apple store but to no avail. The 13in rMBP was bought only two days ago and has the exact same problems with the EXACT same websites.
I am taking them to the store again but I'm not expecting any miracles as this will be my fourth visit to the apple store for the same problem.
Safari, Firefox, Chrome, Opera, Webkit Nightly etc. I've tried them all and they behave the exact same way.
Before you blame the router, I will say again, all the devices on that list other than the rMBP's are flawless over WiFi.

Since you're going back to the Apple Store, test several web sites that you've used at home and see if there is any difference in speed. Then find out what their solutions would be.
As far as videos, I have the Adobe Flash Player (version 11.7.700.169) plug-in installed on my 15" rMBP. Hulu, YouTube and other video sites work great. No lag or decrease in speed. I'm also going through an Airport Extreme Base Station and my rMBP negotiates the connection on the 5GHz band. I don't know if that matters. You can check what band you're on by holding the Option key down and right clicking the WiFi icon in the Menu bar.
Another thought, when was the last time you recycled your DSL/Cable modem and router? It might be worth a shot to shutdown all your devices, unplug the power to the router then the modem. Wait a minute or two, power the modem up; then the router and turn on one of your rMBPs and test.

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