Upload speed is the typical bottleneck for streaming in hd. What upload speed does your isp deliver? A speed test doesn't use the same Protocols as the sling. Your isp could be giving you 768k upload and use some type of compression so the speed test reflects more than your solo is obviously sending. There are many other factors of course but 700k wont give you good HD if any at all. The HD pro sends more data than the solo so it likely you will have even lower speeds on the pro hd.