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I would recommend running your GPUs and Block Erupter all through a local Stratum proxy. This will cut the bandwidth down significantly, and it *may* adjust you to difficulty 2 if your mining speed reaches the point where you pass a shares-per-minute threshold.
umm.. silly question.. but where is the link to download the stratum proxy? I've been all over the btguild website and can't find it. I would think the logical place would be under "support" in the "mining software Download links" section... but I'm not seeing it..
Sigg
Stratum proxy can be found here at the bottom of the page under downloads:
http://mining.bitcoin.cz/stratum-mining