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I don't use 4lb leader but I would like to comment and just base it on theory.
4lb is 4lb, it would be hard not to stress the line even if you were doing a uni under water. with my leader (6lb - 60lb) to pull the turns down best I wet it and hold the main line between my thumb and index finger and slide the knot down with the same hand pinkie nail (other hand pulling down on the swivel, clip, hook, etc). No heat, no warp in the line.
Maybe in your case the line is getting nicked by the pin end of your clip. I gather a fine clip such as what you are using; 4lb leader would be short lived if a fish shaking around rubbed it under pressure along the clip some how.
Trial and error, go no clip. I'm sure that will solve the issue.
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