I have tried several brands of 1/4 size strings. Corelli, Spiros, Obligatos, helicores.I used them on a ply 1/4, a Takamine B10, a Kramer ABG, and a Chennell Arco. They all seemed rather stiff for these instruments. But I recently bought a set of Presto Balance 1/4, and the suit me better than the aforementioned brands, as they are more flexible with smaller gauges, so the thinner top of the Chennell currently strung with them is not overburdened by string pressure. They’re not as bright as spiros , but they bow well, and pizz well. Also cost around $100, but have to be ordered from an European vendor.
Presto Balance