I have had excellent results with EAGLE GRIPS Gunfighter models, either smooth or checkered, on Bisleys and Supers and Vaquero equivalents of both in 357 and 44. In SINGLE ACTION SIXGUNS, one of John Taffin's best books, he mentions Larry Caudill flat filing the Bisley grip frames while making new grips, giving a little more knuckle clearance. Bowen shows some radical trimming and re-shaping of Bisley grips and grip frames in THE CUSTOM REVOLVER. Dustin Linebaugh is also mentioned for doing subtle modifications to his custom grips. Klamath river woodworks and Caryc at clccustomgrips.com have a lot of fans.
This is such a subjective area that no one can give you a "written in stone answer." You may spend some money on your quest---I know I have!