Sound like a new cassette is needed.
How was the chain on the small/small? Was the chain as close to the derailleur as possible?
Surely thats the role of the elephant?
That's a touring bike, the Saracen replace the Genesis Volare, geometry is quite similar but taller headtube, carbon and disc.
@spotter started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Sound like a new cassette is needed.
How was the chain on the small/small? Was the chain as close to the derailleur as possible?