UPDATE: After doing some investigation of the network device(s) configuration; I discovered the multicast looks to be configured properly on the router and switch stack.
For curiosity sake, I have attempted a multicast session for 4 laptops - my transfer rate is approximately 1.85GB/per min. This is exciting. I am going to gradually increase the load from there. If I can get away with 8 devices at a time that would be ideal.
Its strange because I know for a fact upon my first attempt a month ago, multicasting was terrible; it was virtually stationary.