3/8" chain is about 1.7 pounds per foot, and 5/16" G4 is about 1.1 pounds per foot. So your 60 feet of 3/8 was about 100 pounds and assuming you had about 200' of wet 5/8" line at roughly 40 pounds your total was about 140 vs. 200' of G4 is about 220 pounds. So your net gain was about 80. Maybe not so bad.