Nice post, good photos, well displayed. But it seems you are in a low RF area due to the speed you have when the phone is on the table. I'd expect speeds of around 3000 kbps but you are a little over 1000. I get similar results when I am in a low RF area. With strong RF, I can't show any difference in download speeds no matter how I hold the phone. My d/l speeds are around 3 mbps.
As we all know, low RF will increase the carrier to noise ratio and the data rate has to slow down. Just like Wi-Fi, the stronger the RF, the faster the download.
BTW, my iPhone is fantastic. Bought the video editing program. Great but needs a few minor improvements like letting you add titles to still photos.