Hi there,
LSI definitely needs some love but it’s not in the priority list unfortunately.
Your best bet is to try another social icon plugin that might work better for your need.
Tom used Social Icons Widget by WPZOOM here that might be worth trying:
https://gpsites.co/marketer/
Also it is still possible to overwrite !important
, you just have to be more specific in your selector.
https://stackoverflow.com/questions/11178673/how-to-override-important