Daz, your needle valve is just set on the low side.
That’s all it will be. If it’s a perfect temperature for you though, just leave it as it is.
The optimal position though is to be able to adjust from warm - piping hot. That gives you the most variability. I wouldn’t be happy if my max was 30 degrees in winter. That might be what I normally use in winter, but I also like The option to go hotter.