Hello @semitte and welcome to SGL.
You have a very good telescope and you are doing nothing wrong except perhaps you are expecting to see the planets like the photos in books ?
For best planetary results :
1. Cool your scope down by taking both end caps off and pointing the scope down to allow warm air to escape - do this for at least an hour before observing.
2. Once cooled - Check the collimation of your scope and adjust if necessary.
3. Try not to observe on concrete as it retains heat - grass is best and donβt observe over heat sources like neighbours roofs.
4. Observe when the planets are due south which is when they are at their highest elevation.
The planets need quite a lot of magnification, use your zoom to achieve the following :
Jupiter x180 (11mm setting)
Saturn x200 (10mm setting)
Mars x230 (9mm setting)
Jupiter and Saturn are very low at the moment and past this years closest approach, so not showing much detail, but Mars is climbing quite high by midnight now so you should see some surface detail.
Your local sky seeing conditions may vary nightly, some better than others and this will affect your scopes performance.
Do spend lots of time over many nights at the eyepiece observing and waiting for those brief moments of calm seeing which show more detail.
The more you observe the more you will see π
Hope that helps π