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One of the good things about astrophotography is that everything in the Sky has the same focus point.
If you achieve good focus on the moon then you are in focus for all planets and stars in the sky.
The times that the above statement is not correct is:
1) As the ambient temperature drops you do need to refocus but you are still in focus for anything in the sky.
2) There is some mechanical slippage (usually the focuser) when moving away from the moon.
Looking at your setup, I would suggest that your problem is magnification. If you achieve good focus on the moon and then point it at a planet, the planet is in focus but it is very small and not showing detail.
What you may need to invest in is a Barlow to increase your magnification for the planets.
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