There could be a problem if you are on Fast Path. I was on Interleaved and found the FECs went up quite a bit, but that didn't matter as the throughput wasn't affected. On Fast Path it would cause re-transmissions and possibly defeat the object.
The other considerations were that basically I don't do streaming, (on the few occasions I used iPlayer I didn't do this), so a few disconnections in the evening didn't bother me, as my 24-hr variation was 2-3dB, and on LLU I didn't have a DLM to worry about slugging the line because of instability.
Even with evening disconnections, my lowest sync remained considerably higher than if I used 3-4dB sync-time margin to avoid them. Any intermediate setting was pointless, as the inevitable reconnection(s) were at a higher margin so a lower sync. (If you follow that logic).
A good compromise for you may be to sync at 1dB or lower well into night-time.
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