Reconnections every 15 minutes here, not good. I'll try your settings.
It seemed to be fine when I left it at 3am~, then at 6am~ it started losing connection every 10-15 minutes. I don't know if the error count really shot up and caused the loss of sync sadly as I wasn't at the router at the time (just until a moment ago). I imagine DLM will bash my connection tomorrow morning
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EDIT:
Sadly no luck. One thing I am wondering though is if half of the settings are taking effect without rebooting. Reason I say that is because when I enabled UPBO I powered off the device first, unplugged the cable, switched it back on, changed the setting, rebooted and then plugged the cable back in and it seemed to improve the upload attainable speed (as in the previous post somewhere not long ago). However, when changing to the settings you mentioned (and re-enabling UPBO) the attainable upload speed and power levels remained the same and I didn't do a reboot this time, though it did re-sync when I applied the settings, unless of course 'Auto' just chose to keep the previous state and remembered that it was set to disabled.
I've now put the old firmware back on the device. UPBO disabled the attainable upload has returned to around 30000~. Power levels downstream and upstream are now around 6 dBm again.
I can confirm that the previous re-syncs in the early hours on the new firmware appear to have been CRC related, suddenly thousands of CRC errors until a re-sync. It must've re-sync at least 10-15 times. I dread to think what DLM will do tomorrow morning, unless I'm in another frozen state like I was on 60/20. At the moment my connection is 74/20 with no interleaving and I can easily get 80/20, I've been like this for months (since February I believe).
EDIT 2:
Definitely confirmed that changes to UPBO didn't seem to take effect on the connection unless the device was restarted (e.g. power off/on, or a reboot from ASUSWRT). So this might be the case for some of the other settings as well?