Here is a picture of the surface of 3 types of strings...
Round Wounds / Pressure Wounds (Ken Smith Compressors shown here) and Half Rounds (Ken Smith Slick Rounds shown here).
At first half rounds can have some liveliness like rounds but that fades fairly quickly. They also smoothen out as you play them more. Pure Nickel half rounds (D'Addario & SIT) can be and do feel smoother sooner but they are also warmer in tone than the Nickel Iron Alloy Half Rounds (Ken Smith Slick Rounds & GHS Brite Flats). La Bella makes Quarter Rounds which are Stainless Steel and don't have as much of the winding shaved off.
Now the pressure wound type strings in the middle are smother, they are brighter than half-rounds, but not as bright as a true round wound. Ken Smith Compressors & GHS Pressure Wounds are Nickel Iron Alloy so they last longer than Nickel Plated Steel and Stainless Steel which is a plus. SIT makes a Nickel Plated Steel compressed winding string like this. ROTOSOUND does as well (theirs is Stainless Steel). This type of string may be the solution for you (easier on the fingers).
Now, what kind of rounds are you playing? There are some round wounds with smaller diameter outer windings like DR rounds, Fodera, Elrick, and the new Hyper Elliptical wound Dean Markley Helix HD strings. Those will help you keep the brightness while having a softer not as coarse surface.