Hmm..the data doesn't point to any clear issue. Your latency and upload speeds seem good. The fact that your upload is higher then your tier (aka speedboost) makes me think its not a network congestion issue in your area.
Can you describe what happens when you take the test? Specially on the download part. Does it shoot up to 33 and stay there? Slowly build to it? Shoot past 33 and then come back down?
Also, now that I look again, it is kind of weird your 6th downstream channel isn't locking on, but 7-8th are. Its normal for some channels just not to be on, but usually if only 7 channels are on, you get channels 1-7. This is something else. Also the DS SNR is lower on the channels below 5th. I don't know WHAT that means, but I think it may be relevant to the problem. Anyone have any ideas?