brushes are never the same even after proper cleaning, look for Brushmate storage. they are basically suspended in chemical fumes, they work BRILLIANTLY if you dont let the chemical dry out.
Theres also a gel storage version which is also good but you have to wipe the gel off with a rag beforehand, its called Go or store and go , sorry im rubbish with links on this forum. Shame about the brushes, i like wooster stuff a lot, there are brush restorer liquids but its a bit hit and miss if they’ve gone hard.
I always go for quality brushes even for oil paint, theres nothing more irritating than watching the bristles fan out half way through a job