I've been docking in a slip like yours for years, first with a Cat 30, then a Cat 36. I've never used spring lines, just back it out to port like a car (thank you prop walk), then straighten it out and head out the fairway. Coming back in, the amount of speed will vary with the headwind. I used to come in dead slow, but once a long time ago as I brought the bow around into the slip, the wind blew me back out and I was totally screwed. So, if it's really windy, I keep a bit more way on now. Get her into the slip, hit a shot of reverse to bring her alongside on the port side (thanks again prop walk) and step off. Given that you have an outboard, things might vary a bit as I'm not sure if you have reverse. You'll need to monitor your speed more closely if not. Just watch getting blown back out, it's not fun.