Same issue here, also on Scarlett Hub. Bathurst & St. Clair area.
Must be over-saturation as the poor speeds come into play in the evening and into the night, but it's full speed in the day.
I had Rogers initially at our home and never experienced this issue with over-saturation, then switched to Teksavvy DSL due to Rogers' bullshit overages and just not liking giving Rogers my money
Recently switched to Teksavvy Cable as I wanted the higher download speeds.
It's not a huge deal, any expansion will involve growing pains, but would be nice to get some input from Teksavvy staff if they are aware of the issue and going action it.