Did you read the info in ACP about guiding? ACP chooses the exposure interval, and gives you guiding at any rotation without recalibration (which you must do in MaxIm ordinarily). There are several things that must be right. I see a severely flat-topped star. Lower the guide exposure minimum to 1 sec, and put in a 5-10 sec delay after correction in MaxIim to limit the correction rate. Also you will probably need to determine the guide sensor rotation angle. The CalibrateGuider script in ACP is the best way to get this.