I first used 35mm (Plus-X) in 1964. At that time all the magazines recommended grade 3 paper as standard for 35mm. It was because of grain. Thin, underdeveloped negatives were assumed better for 35mm because they limited grain buildup. When I saw the wonderful tones of LF photos I started to question the grade 3 standard. I started using Adox KB 17 and Kodak Panatomic-X. They yielded denser negatives with more contrast that worked very well with grade 2 paper. Then I started developing Plus-X and Tri-X to get better negatives (with more grain) to print on grade 2.