It looks like it's time to get some heavier dumbbells. Going down to 15 reps feels good. It's been a while since I felt a good pump. The weight lifting temptress is calling me. lol I really don't want to lift heavy but I need some resistance if the reps are going to be lower.

3 days per week, strict form, med. rest periods between sets.

curls x6
side shoulder raises x5
front shoulder raises x5
rows x5
bench press x6
tricep extension x5

I'm walking 2.1 miles in the mornings before breakfast and 1.35 in the evenings. Med. to brisk pace. Few rest stops. 6 days per week. One day off a week to rest my joints.