I think you'll be better with the 6lb. test fireline or other 6lb. for #3's I send them with 6lb. fireline.
I use #2 mepps with 4lb fireline alot in shallower water.
# 4's are good with 6lb fireline or 8lb other line.
Hope this helps and please ask anything about Mepps seeing i have so many hours with that lure for sure
h2o<---says there's less than 300 Mepps Experts in the World