Glad to hear you're enjoying the new scope. It takes time to come to know your telescope. The more you use it, the more you will see
Collimation will be critical with this scope. What tools are you using? The collimation springs on the primary mirror are also often too soft and the collimation changes with the altitude at which you point the telescope.
The various streaky lines pointing off to the left on Mars could well be a collimation issue.
Your range of available magnifications seems a bit low to see much detail on Mars to me. 150x to 200x works well for me. Planets require high magnification.
My red dot finder has some locking screws (hex screws from memory) that must be losened before the finder can be aligned. Did you get instructions for the red dot finder that describe locking screws? You really have to get this aligned to have much success.
Unfortunately, Mars is getting smaller every night at the moment. The polar caps on Mars are not easily visible right now as neither of them is tilted towards us. The features on Mars are subtle. Experience and a red filter helps heaps. The easiest feature to see (Syrtis Major) is not facing us in the early evening at the moment either.
Saturn is returning to the evening sky though
You need to stay up a little later for this at the moment.
Hope this helps a bit and enjoy your new scope
Have fun,
Doug