gentle peace,
If its the slick feel of flats you like, you might want to try Elixir coated rounds (polyweb). They are coated with Goretex material (very thin coating) and are very slick, and maintain their tone for months. Cost more to buy, have a little of the new roundwound edge taken off when new (due to the coating), but last much longer than other RWs. If you're a pick player they might fray slightly around where you pick after a while, but this doesn't affect tone.
Luckydog