I once was ranked in the top 20 of the Auto-Imp.Rom. LD Leaderboard. Now I am 52nd. Obviously it is because I have been getting beat by better players. Fine, that's how I will learn and hopefully get better.
But I am being matched a lot more with players in the top 20, than in the 40's or 50's. I have been matched with the #1 player twice in the last two weeks. Is there something in the pairing algorithm other that rating?
Thanks.

It uses a combination of your global rating and your rating for that template.

We are pitted against opponents around our rating in quickmatch?

matchmaking seems to be based upon match rating, which is what is shown ingame. It's a weighted average of your 1v1 rating, real-time, or multi-day, and the specific template as best as I can gather.

However real-time quickmatch games are not matched particularly tightly, the time of day typically has a larger impact on your opponents than your rating.

Example, my most recent opponent:

Contender: The Last Kiss (match rating 154.48)
Contender: bowasz (match rating 44.5)

That's a template I have barely played so my match rating is fairly low, but he has 444.1 global rating, rank 1678 global, and 0 rating on the template whereas I have 65 on the template (rank 49), and 1050.8 global (rank 36).