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As Alchemy has said check your camera angle. I normally align the camera so that pressing the DEC up button the star moves up and visa versa. I don't normally worry about the RA as long as I have the DEC right.
Definately keep your guiding to 2x siderial or less (too high a guide rate will definately do it)
Check to make sure you have your guiding directions around the right way. Is it the pink (dec) or blue (RA) that head off? At the top right hand side of the drift explorer are two buttons, one for reversing the direction of the RA (Blue) corrections and one for reversing the direction of the DEC (Pink) corrections. If your guide speed is right and the line still heads off then click the appropriate colour button, or both if both head off.
I use K3 all the time and I'll admit it can have a steep learning curve, but boy once you've learnt that curve it is a great all round program.
Oh and have you set your guidescope focal length and aperture and your guide camera pixel size and chip size under the Telescope and Camera icon?
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