A little friendly advice. I believe you'll have a better chance of attracting higher ranked competition if you throw up escalating doubles, or even no spoils. Also, although you will find decent competition with unlimited, you'll have a much easier time with chained. (I believe that many consider unlimited-dubs to be far too dependent on who starts.)
Ofc, if your partner is much lower ranked than you that could be losing you competition too..
Though as you've been here since 2006 I suppose I'm not telling you anything you don't know?

Personally I'm not interested in playing unlim-dubs, not really flat-rate either lol, but if you'll compromise and play chained or adjacent, we can play a FR game

Good luck