Mine is at half way but only after I changed the thermostat, which was stuck open.
Before that it was similar to yours and sat at 1/4 unless I did any motorway trips when it would eventually creep up to half.
Its worth changing the thermostat as its a quick, easy job. Warm up time is quicker too.
If the bypass hose shows any signs of age or perishing, change that too. You are half way there anyway if you are doing the thermostat.
Rich