Mars and Venus are very hard to look at through any scope. I have a 10" scope and Venus is just a bright crescent. Not really much to look at.
Mars is also very bright and filters on the EP do make a difference. That said, some detail can be seen on nights when the seeing is very steady. The images you see in the forums on planetary photography are not an indication of what you can see with the naked eye. They are Hi res images and are the result of many frames being stacked on top of each other. Lots of filtering and image processing.
Jupiter when it comes shows more detail than any of the planets. Mars should show you some dark patches in good seeing. I have been looking into the heavens for a long time and never seen the planets really all that great. However, many planetary viewers do claim they can see great detail on moments of extreme calm. Keep trying.
My suggestion is get a couple of planetary filters for your EP's This will help to bring out the detail.
As for Nebula I use and O3 filter which really brings out the detail.
Best of luck. You have a good size scope and should get many years of enjoyment out of it. Checking collimation would also help too.
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