Also not a fan of the birdshead grips. The flare on the lower end of the standard single action grip has a purpose, it helps index the heel of your hand when cocking it one handed.
Regarding factory grips, most of the factory Ruger grips feel like they need rasp work to me. Squareish, blocky, dont fit the grip frame well with edges poorly matching. The factory grips from the 60s were better if I recall correctly. Working down factory grips helps, though the medalions dont appeal to me much. Many aftermarket grips also suffer from much the same things as the factory grips. I bought one set of popular aftermarket grips (not rubber) and took them back immediately.
Comparing Ruger grips with the older Colt eagle grips helped me figure out why the eagles felt so good. I ended up making a couple sets of one piece rosewoods on Rugers, Ive been spoiled, nothing else on Rugers has ever felt good. One almost needs to figure to refinish the grip frame after fitting a set of grips well. Once past that hang-up of the finish, you can work a set of grips down to perfectly match the grip frame.