Assuming you drained the bottles after using K-Meta, it shouldn't be that too much was left in them. Was this a kit or juice you bought? My first guess would be it is just bottle shock and will dissipate and improve in a few months. Most wines need about 4 to six months , some more some less to improve from the bottling process. Time usually will cure most ills. If it was good before, it should be even better in a few months.