Usually in match ups you struggle with a lot. Even though fleet is viable, I personally recommend learning to play with conqueror into all match ups as it's overall the best keystone on Sylas.

It's fixed now! The conqueror page with inspiration secondary shown on the main screen is the meta build

ADC's are squishy so the flat magic pen will shred them. They also have some sort of healing (From their abilities, items or runes) and grievious wounds pretty much nullifies that. Healing supports like Sona, Soraka and Nami are also very popular, so overall morello is a good item for botlane.