I Want To Get it Right For Lateral Raise

I was able to perform with ease 2 sets of 10-12 reps. However, i feel 5 kg on each side too heavy and reduce to half the weightage. After adjusting my weights, i find slight strains only in the last 2 reps of lateral raise. I rested between sets for about 1-2 minutes and feel energized in the end. As for growing my muscles, i have meals 10 minutes after my workout.