Max your line is already Retransmission Low.
I don't think you can trick DLM in to lowering the SNRM target.
If DLM lowers your SNRM to 5dB and increases your sync to 79,999 it will move you to Retransmission High and you will get
slower throughput than you do now.
If that happens post here and I will happily recommend a cap to try lower the line to Retransmission Low.
Until then you shouldn't worry about it or obsess over a couple Mb. You sync considerably higher than most already.
I've always suspected that Openreach's DLM takes FEC errors into consideration, as to whether it's worth removing traditional interleaving or not for example.
That's exactly my thoughts. My experience is it only uses FEC figures when deciding to
remove interleaving or
lower retx from high to low.
i don't believe DLM takes negative action for high FEC, but it may not make positive changes if FEC is working hard.
PS did your rtx_uc figures change?
No change there either. The only noticeable change to any my figures while the line was capped was the FEC's which dropped significantly.
I had the exact same with sticky interleaving on my ECI cabinet. ES were under 100/day for months, well below ILQ green but interleaving would not budge.
Capping the line lowered FEC from circa 10,000/min to just under 1,000/hour and the line returned to fastpath.
I'm not convinced my line will hold retx low unfortunately.
Every single day I have 0 ES/LEFTERS with retx high but so far I've had 33 LEFTERS in the last 12 hours on retx low so it certainly seems makes a difference.
It's no doubt pushing my line which over achieves considerably.
24.6dB attenuation and 1022m long from my last GEA test I do not bad getting 45Mb.