Do the re-transmissions etc look ok to go ahead and do that?
It's pretty irrelevant.
The point of the cap is to lower whatever errors the DLM is monitoring.
If they are high, capping well lower them.
My rtx_tx rtx_uc LEFTERS and ES were almost identical on Retx Low as they were on Retx High.
The cap just gives DLM a nudge to try Retx Low.
The worst that will happen is it will return to Retx High (or possibly a drop to 4dB but unlikely) but from experience the vast majority of lines stay on Retx Low.
Your retransmits are considerably lower than what my line used to get.
My line sat on 3dB Retx Low from the day it changed to that till the day i ceased my line.
I also needed a cap to get Retx Low.