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I would expect that you would be able to make 200x work in your scope.
Assuming that your scope has had time to cool and that collimation is good, I suspect that you may not have quite enough travel left in your focuser.
Do you have it racked all the way in or out?
You may need to adjust the height of your mirror a bit or add an extension to your focuser.
While this sounds scary, it is not. Simply back off (or tighten up depending if you are working to bring the mirror up or down) the collimation bolts an equal amount and re-collimate at this new lower (or higher) position...or add an extension to your focuser to bring it to focus.
As you say that your stars are disc shaped that sounds to me like you are only lacking a little bit one way or the other.
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