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Forget trying to view any thing 30degs or lower from the horizon as you are looking through so much more atmosphere and heat haze.
The best time to view with high power on the planets is when they directly or close to it above you.
Another thing to realize is , with a Newtonian to keep the object centred in the field of view.
Newtonian's suffer from an aberration called coma which causes stars to flare the further away from the centre of the FOV.
The actual area of well corrected FOV on a Newtonian is only very small as in only a few millimetres and varies with the focal ratio of the primary.
The further from the center the less contrasty the image becomes and stars and small moons will grow little tails or sea gulls is another term used.
So to get the best planetary viewing keep the planet centred and best up above 30degs from the horizon.
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