Actually, the camera plays only a small part in autoguiding.
If a camera (whichever camera) can see a star, then it's up to the guiding program to lock onto it and stick with it.
I have autoguided with a Toucam (still do) modified and unmodified versions, DSI-1c, an unknown brand el-cheapo planetary cam, and I even tried my Samsung Deep Sky broadcast camera.
They all shows stars of varying quality, but they all worked fine as the Guiding Program was able to lock onto a star in all of them.
The only time I have had guiding problems is when the 'program' goes wrong, not the camera.
The program I used to use was Guide-Dog, but it was a bit troublesome at times. Now I prefer to use Guidemaster and it locks onto whatever star you want.
I've even used a tiny faint Globular Cluster as a guide star with perfect guiding results
But in short, the DSI you have is excellent for guiding. Maybe you need to use a different guiding program, or tweak the one you have.
Also check your mount for backlash.