In most instances, your really dragging the boat backwards when backing up. What little keel we have wants to maintain the direction it is pointed before you start this process, so turning the wheel can pivot the stern but may not, depending on any wind, current, or other wake action. And the slightest breeze can counter your inputs and neutralize them. Stow the bimini, it is a BIG SAIL! Your best control is in forward thrust, so the act of backing into a slip needs to be preceded by positioning the boat by pivoting it by alternating forward/backward thrust and wheel position. Once aligned, pull the boat backwards into the slip. If you have any breeze, this is going to inevitably be a challenge, and have to allow for drift. I like what
@jawsf16 mentioned about using a single throttle, because it lets you move more slowly, still in control. I have mentioned wind several times now...if you have any, you may be forced to be more aggressive in order to place the boat where you want it without allowing time to drift out of position. For golfers, an analogy would be to a breaking putt. You have two options, let the ball die at the hole, following the fall of the green, or putting firmly, taking some of the break out of it, but making it absolutely necessary to put the ball in the back of the cup or you will spin out. That is very similar to maneuvering this boat in the wind. If you move slowly and let the wind put 100% influence on you, you have to have put it along the correct path to begin with for it to arrive where you want it at the end...or...you can be a little more aggressive with the throttle and speed, and have more authority against the wind, but you better be perfect, because your moving faster towards the point of impact! All in all, this is a feel thing with any boat. The more experience you get the better you get, but you can still be embarrassed...just don't be afraid to back off and try again. Just know when you reach the point of no return and either continue regardless, or abandon the approach. The best advice I could give anyone, is to practice when conditions are calm, both wind and traffic. The same principles will apply in more challenging conditions but you will have to be more on your game! This boat is more fun to maneuver than any boat I have owned before...but don't push a bad position!