@Wipeouthm the DOCSIS 3.0 signal levels (channels 1 to 32 don't look too bad with two attenuators in place, but, the problem with attenuators is that they work in both directions. They drop the outbound signal level to the neighbourhood node as well. As a result, the Cable Modem Termination System (CMTS) which controls the connected modems and provides data services to the modems will command the modem to increase its output levels. The maximum DOCSIS 3.0 output level for three or four channel operation is 51 dBmV. Rogers uses 52 dBmV for some reason. There are power level extensions that are now included in the DOCSIS spec, but I don't believe that Rogers uses them. So, at the present time you have one DOCSIS 3.0 upstream channel running at 51 dBmV and two that are above 52 dBmV. Thats not good, and I would expect you to see problems with upstream data, either in the form of disconnects or slow upstream performance.
Having said that, you have a DOCSIS 3.1 upstream channel running. I don't know if the modem uses that as its sole upstream channel or if the modem is running in a hybrid mode, using both DOCSIS 3.0 and 3.1 upstream paths. I would expect you to see upstream problems in either case. But, hey, maybe not ??
What you really need is to have Rogers adjust the downstream path signal levels to where they should be. That might take a while, so, your chosen path isn't too far off the mark.
Plan B is to install two 6 db Forward Path Attenuators which look like this:
https://www.amazon.ca/line-Signal-Forward-Attenuator-FPA6-54/dp/B07882H96R
The forward path attenuator only drops the downstream signal levels and doesn't do anything to the upstream signal levels. Two of these, in place of the current attenuators should do the job. Personal opinion, you shouldn't have to buy anything to resolve a problem such as this, but, its probably the quickest way to resolve the issue, although, I'd keep pushing Rogers to adjust the line levels to where they should be.
Plan C would be to replace one attenuator with a 3 dB attenuator. That would result in a 3 db rise in the downstream levels and a 3 dB drop in the upstream levels. That still doesn't give you much room to play with in terms of the upstream signal levels.
If you're running into upstream issues now, simply remove one of the attenuators for now and reboot/restart the modem. That should return the signal levels to a range where they can operate as intended, not necessarily great levels, but they should allow the modem to operate as intended.
One last item that can't be overlooked is the signal rise in the downstream OFDM channel, which runs in the Port 15 to Port 7 frequency range. There is a possibility that the signal rise is above the allowed signal rise specs. The Tier One techs that you speak with over the phone probably won't be able to tell you that. Send a message to @CommunityHelps asking @RogersAndy to have a look at your downstream and upstream OFDM signal levels. he has access to a better display that shows the sub-bands in the OFDM channel. I don't know if that display does any analysis of the signal rise, from the bottom of the OFDM channel to the top of the OFDM channel or if it only looks at the signal level within each sub-band on its own.
Follow that link to the @CommunityHelps page when you're logged into the forum. Follow the link to "Send this user a private message" to the message composition page. Fill in the subject matter and add the details as necessary, asking Andy to specifically look at the OFDM and OFDMA channels. Copy the HFC MAC address from the STATUS page of the modem and paste that into the message. That will allow Andy to locate your modem. When you're logged into the forum, watch for a number overlaying the avatar in the upper right hand corner. That avatar serves as a link to your profile page and message inbox and outbox. Follow the links to the message inbox.
If the maximum signal slope has been exceeded in the OFDM downstream or OFDMA upstream channels, there's nothing that you can to about it. This falls into the responsibility of a Senior Tech (Rogers Tech) or a Maintenance Crew.
Edit: At the end of the day, if you can get the signal levels into the correct ranges, and you still suffer from disconnects, then you're part of the group of customers who have been affected by the enabling of the upstream OFDMA channel. There are a good number of customers who are having problems with this and Rogers has been completely silent about this issue. A number of customers have also left Rogers as a result of this issue.
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