The position will change from sail to sail, and to a lesser extent to how a sail is rigged (e.g. draft is further forward/back depending on downhaul/outhaul)
I usually put the board and rig on the beach just before launching, then hook in on the beach and get the balance point. When actually sailing the balance point will be a bit further back due to the apparent wind, but you'll be pretty close to the mark.
An idea - once you've found the sweet spot, measure the distance to the centre of the lines and tie a piece of string to the sail bag handle with this distance marked on it, then you can set them while rigging. (not tried it myself cos I know where my lines go).
Have competitions with your mates to see who can sail the longest no handed, and maybe even no footed! As a bonus, shift the lines too far back to get a bit of forward loop training in.
Matt
I move mine around a fair bit trying to get the optimum placement, but it never feels like I have hit the sweet spot
Is there a general rule of thumb with the placement of these lines
