Can I use a 3.0 mainline with a small lead weight?

Reason: A small lead weight corresponds to a small buoyancy, the response will be more sensitive, suitable for small hooks with fine line to play advantage, fishing for small fish, and if you put on a thick line, due to the hardness of the thick line, conductivity is lower than that of the thin line will affect the float's normal signaling action, so it is not recommended to match with a thick line, it's best to use the main line of about 1 size.