Another step in the right direction.
Exactly one month since the last step.
Having had a look at your stats, you appear to now be in the same place with regards to the DLM before your water incident.
Based on that the Zyxel seems to be giving you 2.5Mb more sync speed than the HG612. 44414 -v- 41880Mbps
Your error rate still seems to be nice and low on the Zyxel - although I expect that may increase tonight due to the lower level of interleaving. Over the past month, you may get the 1 more Err/Sec, but as an average over the month the Zyxel doesnt appear to perform any worse than the HG612.
Bitswap appears to be slightly less than the HG612 & you seem to be displaying a similar bitswap pattern to what I see, in that hardly during the day, but it will increase at night.