Your Signal Power levels and Signal to Noise ratios are fine. The upstream Signal Power levels are slightly high but they shouldn't cause problems. Here they are in a slightly different format.
downstream
Port Freq Mod Signal Signal Channel
ID (MHz) strength noise ID
(dBmV) ratio
(dB)
1 651000000 256QAM 0.300 37.356 10
2 591000000 256QAM 2.200 38.605 1
3 597000000 256QAM 2.300 38.983 2
4 603000000 256QAM 2.100 38.605 3
5 609000000 256QAM 1.900 38.983 4
6 615000000 256QAM 1.300 38.983 5
7 621000000 256QAM 1.300 38.605 6
8 633000000 256QAM 0.800 38.605 7
9 639000000 256QAM 0.700 37.636 8
10 645000000 256QAM 0.300 37.636 9
11 657000000 256QAM 0.600 37.636 11
12 663000000 256QAM 0.400 37.636 12
13 669000000 256QAM 0.700 37.636 133
14 675000000 256QAM 1.100 37.636 134
15 681000000 256QAM 1.400 37.636 135
16 687000000 256QAM 1.700 37.636 136
17 693000000 256QAM 1.200 37.636 137
18 699000000 256QAM 1.000 37.636 138
19 705000000 256QAM 0.600 37.636 139
20 711000000 256QAM 0.400 37.636 140
upstream
Port Freq BandWidth Mod Signal Channel
ID (MHz) Type Strength ID
(dBmV)
1 38596000 3200000 ATDMA 44.250 1
2 23700000 6400000 ATDMA 44.250 3
3 30596000 6400000 ATDMA 44.250 2
Ping times and latency with the CGN3 are an issue. A possible solution is to run the CGN3 in bridge mode and use a third party router for any and all router duties. I'm still waiting for someone to run a ping test to the CGN3, through the router to prove without a doubt that this does resolve latency issues with the CGN3. If you read through many of the threads here you will see that this is an ongoing issue, but to be fair, if you read through other forums you will see that latency is also an issue with other ISPs.
Just to check, did you use the USB Setup Drive to setup the CGN3, including a guest network? If so, I will possibly have instructions to follow to check the CGN3 wireless network transmissions.
Here is a link to a thread page containing a summery that I did not too long ago regarding the CGN3: