My biceps and triceps get stronger rather quickly but don’t really size up as much. I can easily curl 40lbs dumbbells for 20 reps but not sure what my 1RM is for curls, I feel like I’d injure myself if I went above 55s. Tricep cable pulldowns are 140 for 14 or 120 for 20-25. My chest and back are pretty damn big so my arms I feel look disproportionate. Any advice?