My way works
I'm doing single handed prop testing on my M26X now when weather permits and that requires backing into the slip for access to the prop from the dock. I still have several sessions yet to go to get my props fine tuned for the rpm I want at WOT. So consider the following:With no wind or current, I approach my slip at right angles at idle speed, about 50' out from it. The slip is on my port side. I have one or both rudders down, and keel all the way down. The boat pivots much easier and more precisely with a near vertical keel. I bring the boat to a dead stop about 25' past the slip. Slip motor into reverse at idle, and turn wheel so rudders and motor point toward slip. Prop walk and boat momentum gains with distance traveled, as does more control. About 10' before slip entry I cut wheel over hard to turn stern into slip, then put engine in neutral to coast in.With a wind astern you may not be able to coast in, just use idle speed. With wind abeam, you have to allow for windage to turn your bow around the keel faster or slower, depending on direction. With wind astern, you may have to use a momentary forward burst to stop boat once it's in the slip.If you have enough maneuver room, you can pull up to slip and away from it, leaving the stern facing the slip from some distance away, then just keep rudders and motors straight and back straight in. With both rudders down and idle speed only, it negates almost all the prop walk .The mistake I see most often in other sailboats and power boats is impatience. The skipper is going too fast. Easy does it.