I have an older model, but the principals are the same. During launch and retrieve we use only a bow and stern line, no spring lines unless the dock has other boats tied up near us. When we dock our boats, even for fuel or lunch we will use at least one spring line, depending on wind and current, preferably two spring lines to keep the boat in it's spot. We leave our lines tied to the boat's cleat's and secure them inboard while using the boat. For our slip, I tied a fender to the dock cleat where the stern of the boat rests. That fender helps us ID our slip when everybody is out and you don't have to look for the little #'s on the end of the dock. I tie a bow and stern line and then, two spring lines from the middle cleat. I use the tower to tie off fenders, I can get the fenders where they will better protect the hull from the dock, than just using the cleats positions. Tying up the 35' Beneteau is very similar, even though it has no midship cleat, spring lines are just arranged a little differently.
As far as the OP...Cobra ultimates w/ mega fangs, for our model, made a difference in my ability to back into our slip without bumping into everything around us.
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