Are you fishing snaggy waters Ian?
There's yonny's write up and table showing stretch vs diameter /breaking strains on a thread from a few years ago,which is very useful.
From that thread, I started using the GT HD. 15lb, superb line, none of the usual faults, that are common with other mono's.
I used it on my previous syndi that had more Canadian weed than water, never had any issues.
https://www.anglingdirect.co.uk/gardner-gt-hd-mono-line?gclid=Cj0KCQjwt5zsBRD8ARIsAJfI4BhySYV1soidRliRKmfSJM0aaxQzD-t9DuHrCNGp8SzoEYu1Kg6vXCwaAqeYEALw_wcB