In 3 0 (5 0 is closer) Im a huge favorite against any average 1700 player in blitz with rook odds. They would have absolutely no chance to beat me in the long run, assuming that 1700 is their true strength. Trust me on this one, its not even close. At G/60 I should be a clear underdog.
Curtains - I am guessing your blitz game is insanely good but isn't it also somewhat rusty?
Would have to think that would give a 1700 at least a slight chance at 3 0.
I would put you as a favorite of course.
But against a 1700 who has been playing every day and considers himself pretty good at blitz I would think that your stretch away from full-time chess would make it a bit closer.
I'm good and fast at blitz and not really that rusty. Blitz is easy to stay in top form at, because the openings matter a lot less than they do at regular chess. You can get some garbage opening but win anyway through some tricks or by winning on time.
Trust me against a regular 1700 who wasn't a blitz specialist, I would win extremely easily in a long match, most of the time winning on time or by tricking them somehow.