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Some coloured filters can be used to enhance details, can't remember which colour for Jupiter, but most people find (as do I) that any improvement is marginal, if at all.
To reduce the light level, you don't want to stop down the scope as it will also reduce resolution, so you could try a neutral density filter or I have a "twin polariser" filter that comes in handy for full Moon, so something like that may help.
When viewing Jupiter, however, don't expect to see anything like what the guys here will get with even the crudest imaging setup! In my C11 I basically see the bands, the spot and that is pretty much it.
Have you checked the collimation? Just swing to about a 2nd mag star and put in your highest magnification. Either side of focus you should see concentric rings (diffraction) around the centre star.
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