On a flat bench, I can handle about 100lbs total (2 25 lb. plates plus the bar) pretty easily with a barbell. If I do the same exercise with dumbbells, I really start to struggle at about 35lb dumbbells (70 lb total).
Is it normal to only be handle 70% of the weight when using dumbbells vs. barbells? Should I focus on dumbbells for awhile to get my dumbbell weight equal to barbell weight