[roughbeast]

What do you mean by "at times feel a little sluggish"? Is this unexpectedly low speed test results, video buffering taking too long, laggy game experience or web pages taking a long time to fetch? Each of those symptoms can be the result of factors nothing to do with your connection set up.

Your power levels look fine to my untrained eye, not knowing your distance from the street box. Your bonded upstream channels are 64 qam, which I understand to be a good sign.