Ok, so the downhaul was maxed out. The traveller and mainsheet were really loose though with the clew hanging down almost vertically into the water. I'll be sure to undo the downhaul next time though!

I also forgot to mention I not only released the jib sheets but also roller-furled the jib. Thinking about it last night I figured that was probably a dumb thing to do in this case. After all, a jib sausage filled with water is probably quite heavy.

I'm gonna try Jakes approach next time, especially with the added cartwheel effect if I go out on the stern too far. If I can do that consistently it means I can always get the mast to windward easily by spinning the whole boat around at once.
I'm not too keen on bringing aboard more hardware. With the drift as it is and the lake not overly wide I normally only get a couple of tries in before getting blown onto shore.

Dennis