atik 314L+ and Jupiter

[westernwolf]

Hi all
I recently purchased a 314L+ and have been dogged by cloudy skies since. On one brief clear night I tried to image Jupiter as a test, mainly because it is a relatively easy target, however the centre of the gas giant is overexposed and unless I am being an idiot I cannot find a way to get the exposure correct.  At the moment I don't have any filters on the camera as they'll be purchased when I'm next paid, scope used is a Celestron CPC925XLT.
Any advice would be greatly appreciated.
Matt