I've been using Echo inserts for the last few years, I'm using the soft (yellow) inserts but some use the medium (orange) inserts.
Echo J4430S (High Traction) or if this gives a little too much front then use (in the front only) J4432S (High Pressure)
(S=Soft, if you prefer medium then change last letter to M)
Do not use the J4429 or J4431 inserts, they are for Electric use and give too much air gap for IC use.
High pressure puts most of the load on the centre of the tyre
High Traction puts more pressure to the outer edges of the tyre