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[Speed] Please help with my download speeds

So I've been with Comcast for a month so far. I'm in New England in a town that has gotten the Blast and Extreme upgrades so being on Blast I should see speeds of 50/10. My brother who also has Comcast lives five minutes away and he typically sees speeds of 60/12. My max on speed tests is always about 10/10. I've chatted with online chat agents who all say my signals are fine, modem is fine, etc. They always start by telling me my speeds are correct for Blast and I have to paste the link from their own press conference. I have a tech finally coming out Saturday but as I've always read the forums here I figured some of you experts could chime in with your thoughts.

Estimating capacity:
Upstream: 8944 Kbps.
Downstream: 9859 Kbps.

The measurement will take upto 2.5 minutes. Please wait.

Checking for traffic shapers:

Upstream: No shaper detected.
Median received rate: 8698 Kbps.

Downstream: Measurement aborted due to high packet loss rate.

For more information, visit: »www.cc.gatech.edu/~partha/diffprobe

My modem page

Model: Cisco DPC3008
Vendor: Cisco
Hardware Revision: 1.0
MAC Address:
Bootloader Revision: 2.3.1_R3
Current Software Revision: d3000-v302r125532-120517a-L2VPN-CMCST
Firmware Name: d3000-v302r125532-120517a-L2VPN-CMCST.bin
Firmware Build Time: May 17 11:31:04 2012
Cable Modem Status: Operational
Wireless Network:

Cable Modem State
DOCSIS Downstream Scanning: Completed
DOCSIS Ranging: Completed
DOCSIS DHCP: Completed
DOCSIS TFTP: Completed
DOCSIS Data Reg Complete: Completed
DOCSIS Privacy: Enabled

Downstream Channels
Power Level: Signal to Noise Ratio:
Channel 1: 0.6 dBmV 41.6 dB
Channel 2: 1.3 dBmV 42.0 dB
Channel 3: 1.2 dBmV 41.9 dB
Channel 4: 1.4 dBmV 41.9 dB
Channel 5: 1.0 dBmV 41.5 dB
Channel 6: 0.6 dBmV 41.4 dB
Channel 7: 0.1 dBmV 41.2 dB
Channel 8: -0.8 dBmV 40.9 dB

Upstream Channels
Power Level:
Channel 1: 48.5 dBmV
Channel 2: 48.5 dBmV
Channel 3: 0.0 dBmV
Channel 4: 0.0 dBmV

I have no idea what those numbers mean but should I be seeing faster downloads? It's also odd to me that my uploads seem just fine but the download is what is slow. I checked my pole and my drop goes from the pole and then goes through a splitter in the basement and then a splitter in my bedroom (both 2 way splitters). I am using currently a Linksys E2000 router and it's set to WPA2, AES, Auto channel, Auto width, Qos is enabled, and it's running DD-WRT. Ironically before the upgrade I pretty consistently was getting about 22-24 down and 4 up which I felt was fine since I'm running most of these tests wireless. I did hardwire a laptop to the router and got results right in the same range.

Thank you all for any insight you can give me.