First off, I'm not an expert so take the following with a pinch of salt...
If your SNRM is 25 or 19, it's still a lot higher than the 6dB some of us are on - which means it's a good line (my understanding is the higher the better for SNRM).
Kitz has said on a couple of occassions that lines aren't getting G.INP'd now, so you wouldn't expect to see it anyway (especially with a good line). Are you on Fastpath or Interleaved? Suspect Fastpath. If you were on interleaved, G.INP could help move you back to Fastpath - if you're on Fastpath already, G.INP will be of no benefit.
The SNRM fluctuates over time - but if it appears to increase over the course of the day, doesn't this indicate there was more x-talk or whatever earlier on? (possibly because a bunch of people were also resyncing at the same time)
It'd be interesting to see bits per tone etc - this appears to be set when your line syncs, but they do appear to fluctuate during the day. If your line syncs at the same time as everyone else on the cab, there'll be increased noise on the line. Presumably this dictates the bandplan.
The SNRM fluctuation and the bandplan/bits per tone seem to be linked.
I guess if you were to resync 8am you'd probably get different results. I don't know what stats you get on the Sky Hub, but I guess they're not as comprehensive as the BT modems.
Like I say, I'm not an expert - I'm just piecing together things I understand from looking at my own line stats...
